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Worksheets1.3 Proton Number, Nucleon Number and Isotopes
Total questions: 10
Worksheet time: 22mins
The nucleus of an atom consist of:
electrons
protons and electrons
protons and neutrons
neutrons and electrons
How do we call the protons and neutrons that are found together in the
nucleus?
A. nuclei
B. nucleons
C. atomic mass
D. mass number
An atom of an element is electrically neutral because the number of protons
is equal to the number of _____________.
A. electrons
B. neutrons
C. nucleons
D. nucleus
Which of the following statements are TRUE about the subatomic particles?
I. The charge of electron is opposite to the charge of proton.
II. Proton has approximately the same mass with neutron.
III. Electrons and protons are located within the nucleus.
IV. The mass of an atom is concentrated at the nucleus.
A. I, II, and III
B. I, II, and IV
C. I, III, and IV
D. I, II, III, and IV
How many protons, neutrons and electrons are in the neutral atom of Cl 17
35 ?
A. 17 protons, 15 neutrons and 17 electrons
B. 17 protons, 17 neutrons and 17 electrons
C. 17 protons, 17 neutrons and 18 electrons
D. 17 protons, 18 neutrons and 17 electrons
What is the mass number of the element shown?
15
7
8
0
The diagram shows three isotopes of hydrogen element. The heaviest isotope of hydrogen has
three shells
three protons
two neutrons
one electron
Which of the following statements CORRECTLY describes atoms, ions and
isotopes?
I. Neutral atom has equal number of protons, neutrons and electrons.
II. Atoms are the smallest particles of matter that retain the characteristics
of an element.
III. Isotopes are atoms of the same element with unequal number of
neutrons in the nucleus.
IV. Ions are atoms with unequal number of protons and electrons and are
formed when an atom loses or gains electrons.
A. I, II and III
B. II, III and IV
C. I, III and IV
D. I, II, III and IV
