Idon’t understand how to get the atomic number from this diagram can someone explain? i need with 8, 9 and 10 : (

Explanation:      ques 8

I think so it is a hydrogen atom ,because it is only atom atom that has 1 proton .as the question is to identify the atom with no of proton so it is hydrogen .   it has atomic number 1

ques 9

the isotpoe of hydrogen having 2 neutrons is caled tritrium . it has mass number  3

ques no 10

as the protons are present in nucleus and electrons revovle around it so the term is clear . remember atoms do not have defined boundaries .

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%