Benchmark 1 Review - Kristina Thibodeaux | Laabri

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1

Select the true statement about Lithium.

It is a non-metal and is shiny and conducts electricity.

It is a metal and is shiny and conducts electricity.

It is a metal and is dull and does not conducts electricity.

It is a nonmetal and is dull and does not conducts electricity.

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1

Is Beryllium an alkali metal?

Yes

No

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1

What is the correct AZ notation for an element with 12 protons, 13 neutrons, and 13 electrons?

²⁵₁₂Mg

²⁵₁₂Mg^-1

¹²₂₄Mg^-1

²⁵₁₂Mg⁺¹

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1

Which of the following would be an isotope of this atom?

Carbon-12

Nitrogen-7

Carbon-14

Nitrogen-12

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1

Which of the following would be a dull brittle solid?

Sulfur

Neon

Nitrogen

Sodium

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1

What does the 63 represesnt?

atomic number

mass number

number of protons

number of electron

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1

If 50 mg of Iodine-131 was given to a patient, how much would be left after 2 half-lives?

25 g

6.25 g

50 g

12.5 g

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1

In alpha decay the mass

1

What element is X?

²³⁶₉₄Pu

²³³₉₂U

²³⁵_⁹²U

²³³₉₁Pa

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1

How much material will remain after 3 half lives?

50%

25%

12.5%

6.25%

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1

Thorium-232 undergoes 2 alpha decays and 1 beta decay. What is the final isotope produced?

$^{228}_{89}Ac$

$^{228}_{88}Ra$

$^{224}_{87}Fr$

$^{224}_{86}Rn$