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WorksheetsUnderstanding Atomic Concepts
Total questions: 10
Worksheet time: 5mins
What is the atomic number of an element?
The atomic number is the total number of electrons in an atom.
The atomic number is the mass of an atom in atomic mass units.
The atomic number is the number of neutrons in an atom.
The atomic number is the number of protons in an atom.
What does atomic mass represent in an atom?
Atomic mass is the total number of protons in an atom.
Atomic mass is the mass of a single proton in an atom.
Atomic mass indicates the number of electrons in an atom.
Atomic mass represents the average mass of an atom's isotopes.
Which of the following is an example of an isotope?
Hydrogen-1
Oxygen-16
Nitrogen-14
Carbon-14
Which of the following pairs are isobars?
Hydrogen-1 and Helium-4
Boron-10 and Lithium-6
Carbon-12 and Oxygen-16
Carbon-14 and Nitrogen-14
What is the main difference between isotopes and isobars?
Isotopes have the same number of protons but different neutrons; isobars have the same atomic mass but different protons.
Isotopes are elements with different chemical properties; isobars are the same element.
Isotopes have the same number of electrons; isobars have different atomic numbers.
Isotopes have different atomic masses; isobars have the same number of neutrons.
What is the molecular mass of water (H2O)?
16.00 g/mol
20.18 g/mol
22.99 g/mol
18.02 g/mol
Which of the following elements has an atomic number of 6?
Oxygen
Nitrogen
Hydrogen
Carbon
What is the atomic mass of Carbon-12?
14 amu
10 amu
12 amu
8 amu
Which of the following statements is true about isotopes?
Isotopes of an element have different numbers of protons and neutrons.
Isotopes are atoms of different elements with the same mass number.
Isotopes of an element have the same number of protons but different numbers of neutrons.
All isotopes of an element are radioactive.
What is the molecular mass of carbon dioxide (CO2)?
32.00 g/mol
28.02 g/mol
18.02 g/mol
44.01 g/mol
