Question

the electronic configuration of an element x is 282.Find the number of electrons present in the atom of an element x.What is the atomic number.what is the valency of X?​

Answer 1

Answer:

12eletrons , atomic number is also 12and valency is 2-(negative)

Explanation:

the element is magnesium

Answer 2

a) The number of electrons present in the atom of an element x is 12.

b) The atomic number of X is 12.

c) The valency of X is 2.

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.

Thus total number of electrons will be 2+8+2= 12.

Atomic number is equal to the number of protons or the number of electrons for a neutral atom and is specific to a particular element.

Thus atomic number of element X is 12.

Valency is defined as the number of electrons gained or lost in order to achieve nearest noble gas configuration

For configuration of 2,8 and 2, it can lose two electrons to achieve noble configuration of 2,8.

Learn more about atomic number

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