" An atom of an element "X" may be written as "_(4)^(9)X

An atom of the element is represented as "_23^61X ? What is the number of protons in X ?

Atoms of the same element may have different _______.

If the atomic number of an element X is 17, then what will be the atomic number of the element lying in the same group as that of X but in the fifth period?

If the atomic number of an element X is 17, then what will be the atomic number of the element lying in the same group as that of X but in the fifth period?

The atom of an element X has 7 electrons in its M shell. What is the atomic number of element X ?

The mass of one atom of an element X is 2.0 xx 10^(-23) g . (i) Calculate the atomic mass of element X. (ii) What could element X be ?

The number of electrons in the atom of an element X is 18 and the number of neutrons is 22. Which of the following is the correct representation of an atom of this element?