An atom with 3 protons and 4 neutrons will have a valency of :

What is the mass number of an element, the atom of which contains two protons, two neutrons and two electrons?

Which of the following anions has a valency of -3?

If an atom X has 10 electrons and its mass number is 22, calculate number of protons for X

The atoms, in which the number of protons is same but the number of neutrons is different, are known as –

For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr’s model of an atom?