# Quiz - The Periodic Table and Atoms | The Periodic Table and Atoms

## General Chemistry 1 - Quiz - The Periodic Table and Atoms

What is the second period in the periodic table?

Which of the following is not an element of the main group?

Main groups: the 2 groups at the extreme left and the 6 groups at the extreme right of the periodic table. Manganese (Mn) is in group 7 ⇒ it is a transition metal

Which of the following statements is incorrect?

How many atoms of hydrogen do you have in 2.0 moles of H_{2}?

n = $\frac{\mathrm{N}}{{\mathrm{N}}_{\mathrm{A}}}$ ⇒ number of dihydrogen atoms ${\mathrm{N}}_{{\mathrm{H}}_{2}}$ = ${\mathrm{n}}_{{\mathrm{H}}_{2}}$ x N_{A} = 2.0 x 6.022 x 10^{23 }atoms

⇒ number of hydrogen atoms ${\mathrm{N}}_{\mathrm{H}}$ = 2 x ${\mathrm{N}}_{{\mathrm{H}}_{2}}$

What is the SI unit of molar mass?

The SI unit of molar mass M is g.mol^{-1}

What is the mole number of 12.4 g of MgCl_{2} (M_{Mg} = 24.3 g.mol^{-1}, M_{Cl} = 35.5 g.mol^{-1})?

mole number ${\mathrm{n}}_{{\mathrm{MgCl}}_{2}}$ = $\frac{{\mathrm{m}}_{{\mathrm{MgCl}}_{2}}}{{\mathrm{M}}_{{\mathrm{MgCl}}_{2}}}$

with M_{MgCl2} = M_{Mg} + 2 x M_{Cl} = 95.3 g.mol^{-1}