EVERYDAY SCIENCE

Detailed explanation-1: -This is because in an atom the number of electrons is always equal to the number of protons to maintain neutrality. The mass number is equal to the sum of protons and neutrons. If the mass number is double the atomic number then it implies that the number of protons and neutrons are equal.

Detailed explanation-2: -The number of protons in a nucleus is called the atomic number and always equals the number of electrons in orbit about that nucleus (in a nonionized atom).

Detailed explanation-3: -atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

Detailed explanation-4: -Electrons are negatively charged species and protons are positively charged species. In a neutral atom, the number of electrons are always equal to the number of protons.

Detailed explanation-5: -Atomic number of an element tells about the number of protons present. The number of protons present will be equal to the number of electrons. Therefore, the atomic number of an atom is equal to both the number of electrons and protons present in an atom.