📕 Tuesday Oct 13 Radiation (Alpha Decay) CFU

When does radioactive decay occur?

• When the nucleus of an isotope is unstable
• When the nucleus of an isotope is stable
• When the electrons of an isotope are spinning
• When the electrons of an isotope are shared with another isotope

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During Alpha decay the nucleus splits into ____ parts.

• two

• three

• four

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A helium nucleus with two protons and two neutrons is called a(n) ____.  

• alpha particle
• electroscope
• beta particle
• gamma ray

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An alpha particle is sometimes written as

• ⁴₂He

• ⁰_-1e

• ⁰₊₁ e

• ¹₀n

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What is the charge of an Alpha Particle?

• +2

• +4

• 0

• -1

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In alpha decay, the mass number...

• increases by 2

• decreases by 2

• increases by 4

• decreases by 4

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In alpha decay, the atomic number...

• increases by 2

• decreases by 2

• increases by 4

• decreases by 4

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Solve this equation for alpha decay.
²⁰⁹₈₅At = ___ + ⁴₂He

• ²⁰⁵₈₃Bi
• ²⁰⁹₈₆Rn
• ²⁰⁷₈₁Tl
• ²⁰⁸₈₅At

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NGSS.HS-PS1-8

Solve this equation for alpha decay.
²²⁶₈₈Ra = ___ + ⁴₂He

• ²²²₈₆Rn
• ²²⁶₈₉Ac
• ²²⁴₈₄Po
• ²²⁵₈₈Ra

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NGSS.HS-PS1-8

What is the product of the alpha decay of Gold-175?

• Ir-171
• Tl-179
• Au179
• Au171

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