The concept of atoms - Jamb Chemistry Past Questions and Answers

Question 6:

• JAMB 1981

An element X has 127 neutrons and 82 electrons.
Its atomic number is?

A. 209
B. 105
C. 45
D. 82

Question 7:

• JAMB 1981

An element X has 127 neutrons and 82 electrons.
Its atomic number is?

A. 209
B. 105
C. 45
D. 82

Question 8:

• JAMB 1981

The mass number of an atom is?

A. The number of electrons in the atom
B. The number of protons in the nucleus of the atom
C. The number of neutrons in the nucleus of the atom
D. The sum of numbers of electrons and protons inthe atom
E. The sum of numbers of proton and neutrons in the nucleus of the atom

Question 9:

• JAMB 1983

The mass of an atom is determined by

A. Its ionization potential
B. Its electrochemical potential
C. The number of protons and electrons
D. The number of neutrons and protons
E. The number of neutrons and electrons

Question 10:

• JAMB 1986

An element with atomic number twelve is likely to be

A. Electrovalent with a velocity of 1
B. Electrovalent with a valency of 2
C. Covalent with a valency of 2
D. Covalent with valency of 4