Where do i find the grad? What is the Grad???

Answer:sodium

Explanation:

Sodium is the element that has the fewest valence electrons. The correct option is B.

A valence electron is an electron associated with an atom in the outer shell that can take part in the formation of a chemical bond if the surface layer is not closed.

Both atoms in a single covalent bond contribute one valence electron to form a shared pair.

Valence electrons are electrons in an atom's outermost shell, or energy level. For example, oxygen has six electron, two of which are in the 2s subshell and four of which are in the 2p subshell.

Because the highest energy 3s orbital has one electron, neutral sodium atoms have one valence electron.

Thus, the correct option is B.

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Answer:

In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition. Although we call them physical "reactions," no reaction is actually occurring.

Answer:

A

Explanation:

Answer:

Explanation:

1 mole of any gas contains 6.02 x 10²³ molecules of gas

6.02 x 10²³ molecules of CO₂ contains 1 mole of CO₂

8.24 x 10²⁴ molecules of CO₂ will contain 8.24 x 10²⁴/ 6.02 x 10²³ moles at STP

13.6877 moles

mol weight of CO₂ = 44 g

13.6877 moles of  CO₂ = 44 g  x 13.6877 g =  602.25 gm.

Answer:

4.)33.2 g

Explanation:

(1.25E24/6.022E23)×15.99

Answer:

It would be an isotope.

Background Information:

Isotopes are typically elements that have a different number of protons than neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.

Explanation:

If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then we can simply take away the amount of protons from that number, 18 - 8 = 10. If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons we know that this particular atom is an isotope.

It would be an isotope.

Isotopes are elements that have the same number of electrons and protons but different numbers of neutrons. The atomic mass is the total number of protons and neutrons. The atomic number is the number of protons.

If the atomic number is the number of protons that means that this particular element has 8 protons. If the atomic mass is the total number of protons and neutrons then protons

18 - 8 = 10

If we take protons away from the number of protons and neutrons we are left with the number of neutrons. So there are 10 neutrons. Because there are 8 protons and 10 neutrons, or a different amount of neutrons and protons. So, the particular atom is an isotope.

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Answer:

+1

Explanation:

same amount of electrons as protons

The percentage by mass of oxygen in the 25.3 g sample of the unknown compound is 3.16%

From the question given above, the following data were obtained:

Mass of compound = 25.3 g

Mass of oxygen = 0.8 g

The percentage of oxygen in the compound can be obtained as follow:

[tex]Percentage = \frac{mass of element}{mass of compound } *100[/tex]

Percentage of oxygen = [tex]\frac{0.8}{25.3} * 100[/tex]

Thus, the percentage of oxygen in the compound is 3.16%

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Answer:

E3 ubiquitin-protein ligase RING2 is an enzyme that in humans is encoded by the RNF2 gene.

Explanation:

Lewis structure of Radon difluoride has three lone pairs and two bonding pairs.

Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that depict the bonding between atoms in a molecule, as well as any lone pairs of electrons that may be present. It's used to depict how electrons in a molecule are distributed around specific atoms. Electrons are shown as "dots" or as a line between two atoms when they are bonded.

Hence, Lewis structure of Radon difluoride is

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Answer:

25.3 g of KNO₃ contain 0.25 moles.

Explanation:

Given data:

Number of moles of KNO₃ = ?

Mass of KNO₃ = 25.3 g

Solution:

Formula:

Number of moles = mass/ molar mass

Molar mass of KNO₃:

KNO₃ = 39 + 14+ 16×3

KNO₃ = 101 g/mol

Now we will put the values in formula.

Number of moles = 25.3 g/ 101 g/mol

Number of moles = 0.25 mol

Thus, 25.3 g of KNO₃ contain 0.25 moles.

Answer:

Explanation:

In order to find the volume be at 101.3 kPa we use Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

where

P1 is the initial pressure

P2 is the final pressure

V1 is the initial volume

V2 is the final volume

Since we are finding the final volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]

From the question

P1 = 112 kPa = 112000 Pa

V1 = 259 cm³

P2 = 101.3 kPa = 101300 Pa

We have

[tex]V_2 = \frac{112000 \times 259}{101300} = \frac{29008000}{101300} \\ = 286.3573543...[/tex]

We have the final answer as

Hope this helps you

Answer:

matter is anything that has mass and takes up space

Explanation:

Answer:

fission

Explanation:

Oxygen

Oxygen is considered an element because it cannot be broken down any farther.

Answer:

You subtract the given atomic mass by the atomic number

Explanation:

The answer is the explanation

Answer:

Ionization energy

Explanation:

Ionization energy can be defined as the energy needed to remove an electron from the outermost she'll.

Answer:

Making observations

Explanation:

Answer:

Carbon dioxide, or CO2, is a naturally occurring linear compound composed of two oxygen atoms covalently bonded to a carbon atom. The two C=O. Carbon DioxideA central carbon atom is connected to two oxygen atoms via double bonds in a linear structure.

Explanation:

Answer:

A. Antoine Lavoisier

Explanation:

He is know for creating the first chemical textbook. This textbook included rules for naming different chemical compounds, which is the still the same method we use to this day.

Hoped this can help! :D

Answer:

a

Explanation:

Answer:

Explanation:

In a similar way charged particles such as electrons need to have work done to move them from one point to another. The amount of work per unit of charge is called is called the electric potential difference between the two points. The unit of potential difference is called the volt.

Answer:

A system is a collection of parts that interact together for a common purpose. But a system is not just any old collection of parts. No single part can do the job alone, and any malfunction or delay is likely to affect the whole system. A body system is a set of body parts that do a particular task.

Explanation:

Answer:

A

Explanation:

The skin, mucous membranes, and endothelia throughout the body serve as physical barriers that prevent microbes from reaching potential sites of infection. Tight cell junctions in these tissues prevent microbes from passing through.

Hope this helps:)

Answer:

Nickel atoms have 28 electrons and the shell structure is 2.8. 16.2. The ground state electron configuration of ground state gaseous neutral nickel is [Ar]. 3d8.

Explanation:

Answer : 3.53x10⁻³ ml

Density : the ratio between mass and volume

Can be formulated :

[tex]\tt \boxed{\bold{\rho=\dfrac{m}{V}}}[/tex]

ρ = density, kg/m³ or g/ml

m = mass, kg or g

V = volume = m³ or ml

While mol : dividing mass with molar mass(MW=molecular weight)

[tex]\tt n=\dfrac{mass}{MW}[/tex]

n= mol

mass = grams

MW = molecular weight ,g/mol

moles : 0.00024 moles of Mercury(Hg)

MW of Hg = 200,59 g/mol

so the mass of Mercury :

[tex]\tt mass=moles\times MW\\\\mass=0.00024\times 200,59\\\\mass=0.048~g[/tex]

Because the density of Mercury is 13.6 g/mL, then the volume :

[tex]\tt V=\dfrac{mass}{density}\\\\V=\dfrac{0.048~g}{13.6~g/ml}\\\\V=\boxed{\bold{3.53\times 10^{-3}ml}}[/tex]

Answer:

do u mean ironically? if so here are some:

they're hard and very brittle!!

good insulators

contain high melting points

the form crystals

Answer:

Ionic

Explanation:

Ionic compounds generally form between elements that are metals and elements that are nonmetals. For example, the metal calcium (Ca) and the nonmetal chlorine (Cl) form the ionic compound calcium chloride (CaCl2).