Question

An element with the atomic number 11 is an alkali metal.

Into which families you shall place elements with atomic numbers 10 and 12 respectively.

Answer 1

Modern periodic table:

• The modern periodic table is an arrangement of all the elements known in accordance with their increasing atomic number and recurring chemical properties.
• It is a tabular display of 118 chemical elements which consists of horizontal rows called periods and vertical columns are called groups.
• All elements in a group have the same number of valance electrons, and in period elements have the same number of electron shells.
• There are seven periods and eighteen groups in the modern periodic table.

Electronic configuration:

• The electron configuration of an element describes how electrons are distributed in its atomic orbitals.
• It can be written in K, L, M, and N format. Where the K, L, M, and N shells represent the energy shells.
• The total number of an electron in the shell is given by the formula 2N², where N is the shell number.
• For the K shell maximum number of electrons that can be acquired is 2, the L shell maximum number of electrons that can be acquired is 8, and so on.

Atomic number 10:

• Electronic configuration for atomic number 10 = 2,8
• As the outermost shell is completely filled it must be kept Nobel gas family because their outer shell is completely filled.
• This chemical element is Neon.

Atomic number 12:

• Electronic configuration for atomic number 12 = 2,8,2
• As the outermost shell has 2 electrons in it, therefore it must be kept Alkaline earth metals family that is group number 2 because they have 2 valance electrons.
• This chemical element is Magnesium.