Question

The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in​

Answer 1

Answer:

14th group(4A)

3rd period

Explanation:

no. of orbitals =no of periods

no. of electron in valence shell =group no.

Answer 2

Answer:

The element M is placed in the 3rd period and 14th group of the modern periodic table.

Groups and Periods:

• In the modern periodic table, the vertical columns are termed groups, and the horizontal rows are termed periods.
• The elements placed in the same group have the same number of valence electrons.
• The atomic radius decreases as we move left to right in a period.
• There are 18 groups and 7 periods in the modern periodic table.

Explanation:

The electronic configuration of the given element M is 2, 8, 4.

Hence, the element M has a total of 14 electrons of which, the number of valence electrons is 4.

The element from the modern periodic table with atomic number 14 is Silicon.

It is placed in the third period and the fourteenth group of the modern periodic table.

Therefore, element M is placed in the 3rd period and 14th group and element M is Silicon(Si).

#SPJ3