Practice MCQ Questions and answers on Chemistry-GK

Atomic number is the number of protons, and therefore also the total positive charge, in the atomic nucleus.

Rutherford's gold foil experiment demonstrated that almost all of the mass of an atom is in a tiny volume in the center of the atom which Rutherford called the nucleus. This positively charged mass was responsible for deflecting alpha particles propelled through the gold foil.

Number of neutrons in an atom of hydrogen is zero.

The atomic number of carbon is 6 and its atomic mass is 12 then there is 6 protons in the nucleus.

An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is 19.

Atoms of same element having different mass numbers are called isotopes.

Iron has 30 neutrons.

The electronic configuration of an atom having atomic number ‘20’ is 2, 8, 8, 2.

The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral.

Nucleon is one of the particles that makes up the atomic nucleus. Each atomic nucleus consists of one or more nucleons, and each atom in turn consists of a cluster of nucleons surrounded by one or more electrons. There are two kinds of nucleon: the neutron and the proton. The mass number of a given atomic isotope is identical to its number of nucleons. Thus the term nucleon number may be used in place of the more common terms mass number or atomic mass number. Until the 1960s, nucleons were thought to be elementary particles, each of which would not then have been made up of smaller parts. Now they are known to be composite particles, made of three quarks bound together by the so-called strong interaction. The interaction between two or more nucleons is called inter-nucleon interactions or nuclear force, which is also ultimately caused by the strong interaction. (Before the discovery of quarks, the term “strong interaction” referred to just inter-nucleon interactions).