Which two statements are true? A. The samples both have a metallic luster.
B. The samples are the same color.
O C. The samples have the same hardness.
O D. The samples have the same streak.

A. The atomic number and the mass number will decrease.

Explanation:

Alpha decay : When a larger nuclei decays into smaller nuclei by releasing alpha particle. In this process, the atomic number and mass number is decreased by 2 and 4 units respectively.

General representation of an element is given as:  

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

General representation of alpha decay :