HELP ASAP QUESTION 13

1. 208

2. 82

3. Pb

Explanation:

²¹²₈₄Po —> ⁴₂He + ᴬZX

1. Determination of mass number A of the new atom.

212 = 4 + A

Collect like terms

212 – 4 = A

208 = A

A = 208

Thus, the mass number is 208

2. Determination of the atomic number Z of the new atom.

84 = 2 + Z

Collect like terms

84 – 2 = Z

82 = Z

Z = 82

Thus, the atomic number is 82.

3. Determination of the symbol of the new atom.

ᴬZX => ²⁰⁸₈₂X

The atomic number of the new atom is 82. Comparing the atomic number of the new atom to those in the periodic table, the new atom is lead with symbol Pb.

Thus,

²⁰⁸₈₂X => ²⁰⁸₈₂Pb

Therefore, the symbol of the new atom is Pb.

it would be d. henry moseley

hope this !

and sorry if i'm late. have a good rest of your day! : d

16

explanation:

the marks go by 4s