Abalanced chemical equation indicates both the number of particles of reactants and products and the number of
a. orbits.
c. nuclei.
b. electrons.
d. moles

Option (d) is the correct answer.

Explanation:

A chemical reaction equation that shows same number of reactants and products is known as a balanced chemical equation.

For example,

Here, number 2 placed before the sodium (Na) atoms depicts that 2 moles of sodium reacts with 1 mole of chlorine to give 2 moles of sodium chloride salt.

Therefore, in a balanced chemical reaction equation number of moles are also equal on both reactant and product side.

Thus, we can conclude that a balanced chemical equation indicates both the number of particles of reactants and products and the number of moles.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

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