How many silver (ag) atoms are in a silver bar that is 20.0 g? ?

To calculate this we first need to calculate the number of moles of Ag atoms:
moles = mass/RAM (Relative Atomic Mass) where the RAM of Ag = 108 g/mol.
Therefore moles(Ag) = 20.0g / 108g/mol = 0.185 mol
In one mole of Ag there are 6.022 x 10^23 atoms (Avogadro's constant), therefore the number of atoms in 20.0g of silver is:
(6.022 x 10^23)*0.185 = 1.11 x 10^23 atoms

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

The correct answer would be b) volume versus temperature, because they are also directly proportional.