What name is given to the amount of substance containing 6.022 × 10²³ particles (atoms, molecules or ions) of a substance?

The atom of an element X contains 17 protons, 17 electrons and 18 neutrons whereas the atom of an element Y contains 11 protons, 11 electrons and 12 neutrons.

(a) What type of ion will be formed by an atom of element X? Write the symbol of ion formed.

(b) What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from X?

(c) What type of ion will be formed by an atom of element Y? Write the symbol of ion formed.

(d) What will be the number of (i) protons (ii) electrons, and (iii) neutrons, in the ion formed from Y?

(e) What is the atomic mas of (i) X, and (ii) Y?

(f) What could the elements X and Y be?

What is a group of 6.022 × 10²³ particles known as?

What is the numerical value of Avogadro number?

How many atoms are present in one gram atomic mass of a substance?