I need the answer really fast !!! Help

Answer:

Electrons on the last energy level.

The period on the periodic table (1 to 7) tells the number of energy levels in an atom. Therefore, option A is correct.

The horizontal rows in the modern periodic table are known as periods. All elements placed in a particular period have an equal number of electron shells. Each next element exceeds one proton in a period and so exhibits less metallic character than its precursor.

The atomic number of the elements increases from left to right in a period that gives information about the number of electrons and protons increases in an atom. As in a period, elements have filled an equal number of electron shells, but an increased electron in the same shell causes an increase in the nuclear charge. Therefore, the atomic radius of an element of the elements reduces in a period.

Therefore, the elements in the same period (1 to 7) have the same number of electron shells or energy levels.

Learn more about periods, here:

brainly.com/question/6778376

#SPJ2

Answer: False; it contains particles, but that doesn't mean it's a particle itself.

Hope this help.

The statement is false, both atoms and molecules could be referred to as particles.

An atom is defined as the smallest particle of a substance that can take part in a chemical reaction.

An atom is the smallest particle of a an elemental substance while a molecule is the smallest particle of a compound. Compounds are made up of molecules which are neutral particles.

The main difference between an atom and a molecule is that a molecule is a group of atoms held together by a chemical bond while atoms just occur individually.

Learn more: https://brainly.com/question/19922822

Answer:

true

Explanation:

Volcanos is rock and there's where the carbon stored at.

Answer:

The answer is c) moon’s motion without gravity

Explanation:

I just took the quiz and I got 100 percent on Edgenuty :)

The dotted-line arrow is representing the path the moon would take if there was no force of gravity on the earth. Therefore, option (C) is correct.

Gravity can be explained as a force that attracts an object toward the center of the earth or any physical system that has mass. Each body with mass exerts a force or gravity on every other body with mass. Gravity is the force that keeps the moon around the earth and the planets in orbit around the sun.

In the universe, each particle with mass attracts another particle with a definite force, and that force acting is a product of the masses of those bodies.

Mathematically gravity acting between masses can be written as:

[tex]F =G\frac{q_1q_2}{r^2}[/tex]

Where F is the force, m and M are masses, G is the universal gravitational constant and r is the separation between them.

If the moon follows the dotted arrow which moves straight ahead it can be only possible if the moon's motion is without gravity.

Learn more about gravity, here:

brainly.com/question/1479537

#SPJ2

Answer:

Chlorine is a very reactive non metals because this element don't form any known chemical compound.

Explanation:

Chlorine atoms have a lot of valance electrons without being complete on its own, so it has a greater need to seek it's conjugates. That's called electronegativity. Halogens are highly reactive because of their electronegativity.

answer:

no

explanation:

cause you dumb

Answer:

i think the answer is Y

Explanation:

Answer:

Both graphs tell you how something is changing over time. In a velocity-time graph, time is on the horizontal axis, or x-axis, and velocity is on the vertical axis, or y-axis. ... The rising line on the velocity-time graph shows where the acceler- ation is positive. The steeper the line, the greater the acceleration.

Explanation:

Answer:

put it through a distillery

1.The solution will gradually become colorless as the sulfur dioxide reacts with the potassium permanganate(Potassium manganate(VII))

The reaction

2MnO₄⁻ (aq) + 6H⁺ (aq) + 5SO₃²⁻ (aq) -> 2Mn²⁺ (aq) + 3H₂O (l) + 5SO₄²⁻ (aq)

2. Natural gas is a mixture of hydrocarbon gas with methane (CH₄) as the main composition in addition to other gases such as CO₂ and H₂

3. Halide ions are detected using silver nitrate (acidified using nitric acid) which forms deposits of different colors

Br-Bromide ions: cream

Cl-Chloride ions: white

I-Iodide ions: yellow

so the answer Potassium iodide

4. Compounds that are alkaline are useful for neutralizing acids including the desulfurization process to neutralize acidic gases (SO₃). The bases used are lime or caustic soda

Lime can be Calcium oxide (CaO - quicklime)

5. Ethanol (C₂H₅OH) can be made from C₂H₄ (ethene) with steam, apart from the Alcoholic fermentation of glucose

6. Compounds are formed from 2 or more types of elements which can be ionic compounds or covalent compounds

Answer:

B

Explanation:

black peppered moths have higher survival rate

Explanation:

i believe black peppered moths would survive at a higer rate than white moths. black peppered moths could blend with the environment while white moths would stick out and make its self more vulnerable to predators.

Answer: C

Explanation:

Answer:

Replacement

Explanation:

i took the quiz :)

Given reaction in the question is a type of replacement reaction because in that reaction sodium atom replaces the silver atom from the silver nitarte molecule.

Replacement reactions are those reaction in which one or two atoms will replaced by another atoms.

In the given chemical reaction, sodium atom replaces the silver atom from the silver nitarte molecule as a result od which we get different products.

Hence the given reaction is the replacement reaction.

To know more about replacement reaction, visit the below link:

https://brainly.com/question/26591211

#SPJ2

Answer: Skeletal muscle tissue helps marks body to perform to this activity as it has such supportive structure and position in the body that he is able to do it

Explanation:

Answer:

Muscles give structure and power for any kind of movement, so the tissue needs to be flexible and tightly packed for movement. The tight bands of tissue shown in the picture allows this movement to occur.

Explanation:

answer on edmentum.

Answer:

Graduated cylinders, beakers, volumetric pipets, burets and volumetric flasks are five kinds of glassware often used to measure out specific volumes. Volumetric pipets, flasks and burets are the most accurate; the glassware makers calibrate these to a high level of accuracy.

Explanation:

hope this helps :)

Answer:

X and Y

Explanation:

There is no explanation

Answer:

x and w

Explanation:

Answer:

True.

Explanation:

You didn't provide an answer, but I'm assuming this is a T/F question.

Answer:

Explanation:

Nonmetals share many similar properties including:

They are either gas (hydrogen, oxygen, nitrogen) or solid (carbon, sulfur) under standard conditions.

They are not good conductors of electricity or heat.

They are very brittle in their solid form.

They are not malleable or ductile.

The most likely prediction based on the data is 'organisms that require a steady salinity move freely between sea level and -0.4 km' (Option B).

In conclusion, the most likely prediction based on the data is 'organisms that require a steady salinity move freely between sea level and -0.4 km' (Option B).

Learn more in:

https://brainly.com/question/2601533

Answer:

A scientific experiment undertaken to make a discovery, to test a hypothesis or to demonstrate a known fact.

Explanation:

Experiment is described as attempting something new or testing a theory. An example of an experiment is when you try a new style of hair. An example of an experiment is when you use test tubes and chemicals in a chemistry lab to complete a project to try to better understand the chemical reactions.

Answer: The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the remaining electron in the 3s. Therefore the sodium electron configuration will be 1s22s22p63s1.

Explanation:

Answer:

Sodium chloride

Brainlist??

Answer:Nothing, the photon just bounces off the surface.

Explanation:

According to Albert Einstein, a photoelectron can only be emitted from a metal surface when the energy of the incident photon is greater than the work function of the metal.

In the scenario described in the question, the work function of the metal is greater than the energy of the photon. Hence, the photon just bounces off the metal surface without emitting any electron.

Answer:

The correct option is;

C) Nothing, the photon just bounces off the surface

Explanation:

The given parameters are;

The work function of the silver surface = 4.73 eV

The amount of energy of the photon = 2.5 eV

The kinetic energy, KE[tex]_e[/tex] of an electron when ejected from a metal surface is given as follows;

KE[tex]_e[/tex] = h·f - B·E

Where;

hf = The energy of the photon

B·E = The work function of the metal

Whereby the energy of the photon impacting on the surface of the silver is equal to or larger than the work function of the silver surface, then the energy of the photon can be reach the electrons of the silver so as to be enable the electron to be ejected through the metal surface

However, given that the energy of the photon, 2.5 eV, is less than the work function of the silver surface, 4.73 eV, the kinetic energy of an ejected electron, KE[tex]_e[/tex], is less 0, therefore, no electron will be ejected form the surface of the silver and the photon just bounces off the surface.

Answer: Light waves are correct, sounds waves are not.

Explanation: Sound waves are close to light waves however they are closer together, hope this helped :)

Seems about correct to me.

Answer:Explanation:

Convection drives the circulation of air in the earth's atmosphere. The sun heats the air near the earth's equator, which becomes less dense and rises upward. As it rises, it cools and becomes less dense than the air around it, spreading out and descending toward the equator again.

Explanation:

Chromium, carbon and calcium

I did the same quiz and got a 100 (Brainliest pls)

Answer:

c. mass

Explanation:

In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.

Explanation:

Thank you ☺️☺️

Answer:

A.1

Explanation:

The coefficient needed in front of NaNO₃ to balance the equation

Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.

A balanced chemical equation is an equation that has equal numbers of atoms for each element both on the reactant and product sides.

Methods to balance the chemical equation -:

The number of atoms for a given element is calculated by multiplying its coefficient with the element’s subscript in its chemical formula.

The coefficients in front of the formulas to show how many molecules of that material are used or produced.

Hence, the coefficient needed in front of NaNO₃ to balance the equation

Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.

Learn more about chemical equation ,here:

https://brainly.com/question/12047033

#SPJ6

Take 23mols and multiply it by the atomic mass of Li:

23mol  * 6.94g/mol = 159.62g