(4)2-8-7-1
The maximum number of electrons in the second two shells is 8, but since there is 7 in the third she'll and 1 in the fourth, that means that one electron was moved to the last shell, putting the atom in the excited state.
Explanation:
(a) As per the mole concept, one mole of any atom contains atoms or molecules, that is, Avogadro's number of atoms.
Therefore, 1 mole of = molecules
= molecules
1 mole of = molecules
= molecules
1 mole of = molecules
= molecules
Hence, there are equal number of molecules present in the given atoms.
(b) Mass of each given atom will be calculated as follows.
Mass = no. of moles × molar mass
As one molecule of contains 2 atoms of hydrogen.
So, mass of 1 mole of =
= 2.016 g
mass of 1 mole of =
= 31.996 g
mass of 1 mole of =
= 37.996 g
Thus, we can conclude that has the greatest mass.
Answer: Atomic Mass
Explanation:
The Atomic mass of an atom is the number of protons and neutrons in the atom and is measured in atomic mass units (amu) but can still be measured in kilograms.
For example, if the number of neutrons in an atom is 8 and the number of protons is 6, the atomic mass of the atom is 14.