If 60.2 grams of hg combines completely with 24.0 grams of br to form a compound what is the percent compostiton of hg in the compound

71.5 %

Explanation:

                mercury + bromine ⟶ compound

Mass/g:       60.2          24.0

According to the Law of Conservation of Mass, the mass of the product must equal the mass of the reactants

Mass of product = 60.2 + 24.0

Mass of product = 84.2 g

The formula for percent composition is

% by mass = mass of component/total mass × 100 %

% Hg = 60.2/84.2 × 100

% Hg = 0.7150 × 100

% Hg = 71.5 %

beta decay is the answer

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8