Question

The electronic configuration of two elements X and Y are 2,8,7 and 2,8,8,3 respectively. Write atomic numbers of X and Y.

Answer 1

atomic no. of X is 17 and atomic no. of Y is 21.
mark BRAINLIEST.

Answer 2

Answer:

The atomic number of X is 17.

The atomic number of Y 21.

Explanation:

The electrical configuration of an atom is the distribution of electrons among its orbitals.

Electron configurations provide insight into the chemical behaviour of elements by determining the valence electrons of an atom. As a result, analysing the properties of the elements as a group is easy.

The atomic number is the number of unit positive charges on the nucleus of an atom of a certain element.

X has an atomic number of 2+8+7, which equals 17, and Y has an atomic number of 2+8+8+3, which equals 21.

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