1. A typical α-decay from a parent nucleus AZX may be indicated as : Group of...

1. A typical α-decay from a parent nucleus ^A_ZX may be indicated as :

Group of answer choices

^A_ZX → ^(A−4)_{(Z − 2)} Y + ⁴₂He

^A_ZX → ^(A+4)_(Z+2) Y + ²₂He

^A_ZX → ^(A−4)_Z Y + ⁴₂He

^A_ZX → ^(A−4)_(Z+2) Y + ⁴₂He

2. An element of atomic number 83 in a relatively higher energy state decays radioactively to an element of atomic number 84 with lower energy level. This must include

Group of answer choices

an α emission

a β emission

a γ emission

a β & γ emission

3. The half- life of radium-226 is 1.6 × 10³ . If a sample initially contains 3.0 × 10¹⁶ such nuclei, what is the number of radioactive radium-226 nuclei remaining after 4.8 × 10³ years?

Group of answer choices

2.25 × 10¹²

3.75 × 10¹⁶

2.2 × 10¹⁶

3.75 × 10¹⁵

Solutions

Expert Solution

genius_generous answered 1 year ago

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