Here you can find all IGCSE chemistry MCQs on Atoms and Elements topics.
1. Which statement about an atom of fluorine, 19F9 , is correct?
A It contains more protons than neutrons.
B It contains a total of 28 protons, neutrons and electrons.
C Its isotopes contain different numbers of protons.
D Its nucleus contains 9 neutrons.
2. Which statement about the isotopes of an element is correct?
A Their physical properties are different because they have different proton numbers.
B Their atomic masses are different because they have different numbers of electron shells.
C They have the same chemical properties because they have the same number of electrons in their outer shells.
D They have the same physical properties because they have the same number of neutrons in their nuclei.
3. Which two molecules contain the same number of electrons?
A Cl 2 and SO2
B CH4 and H2O
C CO and NH3
D CO2 and HCl
4. How many neutrons are present in the atom 45X21 ?
A 21 B 24 C 45 D 66
5. Two naturally occurring isotopes of oxygen are 16O and 17O.
Which statement is correct?
A Both isotopes react with iron to form rust.
B Neither isotope reacts with iron to form rust.
C Only 16O reacts with iron to form rust.
D Only 17O reacts with iron to form rust.
6. Which statement describes isotopes?
A Isotopes of the same element have different electron arrangements.
B Isotopes of the same element have different nuclear charges.
C Isotopes of the same element have nuclei with masses that are the same.
D Isotopes of the same element have the same number of protons.
7. Which substance is not a macromolecule?
A diamond
B graphite
C silicon(IV) oxide
D sulfur
8. Which substances have similar structures?
A diamond and graphite
B diamond and silicon(IV) oxide
C graphite and poly(ethene)
D graphite and silicon(IV) oxide
9. How many silicon atoms are bonded to each oxygen atom in a crystal of silicon(IV) oxide?
A 1 B 2 C 3 D 4
10. Iron has an atomic number of 26. It occurs as the isotopes 54Fe, 56Fe, 57Fe and 58Fe.
Which statement explains why these isotopes have the same chemical properties?
A They have similar mass numbers.
B They have the same number of electrons in their outer shells.
C They have the same number of neutrons in their nuclei.
D They have the same number of protons in their nuclei.
After doing these IGCSE chemistry MCQs on Atoms and Elements topics, you should be confident about the topic.
Also read MCQs on states of matter here.
