Which of the following materials is most effective for stopping gamma radiation?

1 answer:

5 0

Several centimeters of lead. Gamma rays have the highest penetrating power and therefore need a thick layer of something, in most cases lead, to prevent penetration. (This is why if you have ever go to the dentist they put a heavy thing on you made of lead, to prevent the penetration of gamma rays that can destroy your most important organs).

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OlgaM077 [116]

Explanation:

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Nitrogen (N) needs three more electrons to fill its outermost energy level. What is the number of electrons that Nitrogen (N) ha

Georgia [21]

Answer: 5

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5 is the number of electrons in the outermost shell

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2 years ago

18. The mass of a quantity of NiCl2 is 24.6 g. How many formula units are in the sample?

Charra [1.4K]

Answer is: A. 1.1 3 1023 NiCl2 formula units.

m(NiCl₂) = 24.6 g; mass of nickel(II) chloride.

M(NiCl₂) = 129.6 g/mol; molar mass of nickel(II) chloride.

n(NiCl₂) = m(NiCl₂) ÷ M(NiCl₂).

n(NiCl₂) = 24.6 g ÷ 129.6 g/mol.

n(NiCl₂) = 0.19 mol; amount of nickel(II) chloride.

Na = 6.022·10²³ 1/mol; Avogadro constant.

N(NiCl₂) = n(NiCl₂) · Na.

N(NiCl₂) = 0.19 mol · 6.022·10²³ 1/mol.

N(NiCl₂) = 1.13·10²³; number of formula units.

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3 years ago

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6. If 4 grams of salt is dissolved in 79 grams of water, what is the total mass of the final solution? [1 mark]

nordsb [41]

Answer:

A) 83g

Explanation:

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3 years ago

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(Direct answer=Upvote cause I aint smart xD)

Vedmedyk [2.9K]

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2 years ago