Quiz 1 - Periodic Table & Atomic Mass | The Periodic Table and Atomic Mass

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

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 10²³ atoms

⇒ number of hydrogen atoms ${\mathrm{N}}_{\mathrm{H}}$ = 2 x ${\mathrm{N}}_{{\mathrm{H}}_2}$

The SI unit of molar mass M is 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

Metals are typically not brittle; they are malleable (can be hammered into thin sheets) and ductile (can be drawn into wires).

Among the given options, uranium has the highest atomic mass, with an atomic mass of approximately 238.03 amu.

Alkali metals are found in Group 1 of the periodic table and include elements such as lithium, sodium, and potassium.

One mole of CO₂ contains 3 atoms (1 carbon and 2 oxygen). Therefore, 2 moles of CO₂ contain 2 × 3 × 6.022 × 10²³ = 3.613 × 10²⁴ atoms.