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1. Mass of New atom = 208

2. Atomic number of the new atom is 82

3. Symbol of the new atom is Pb

Explanation:

²¹²₈₄Po —> ⁴₂He + ᴬZX

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

212 = 4 + A

Collect like terms

212 – 4 = A

208 = A

A = 208

Therefore, the mass of the new atom is 208

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

84 = 2 + Z

Collect like terms

84 – 2 = Z

82 = Z

Z = 82

Therefore, the atomic number of the new atom is 82

3. Determination of symbol of the new atom

The atomic number of the new atom is 82. Comparing the atomic number of the new atom (i.e 82) with those in the periodic table, the new atom is Lead.

Lead has a symbol of Pb

Thus,

Mass of new atom (A) = 208

Atomic number of new atom (Z) = 82

Symbol of new atom (X) = Pb

Therefore,

ᴬZX = ²⁰⁸₈₂Pb

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.