Atomic Structure Practice
8 problems · instant feedback · full explanations
Everything about an atom's identity and mass comes down to counting three particles. These eight problems drill atomic number, mass number, and isotopes until the relationships feel automatic.
Q1.
Which subatomic particle carries a negative charge?
Multiple choice · Beginner
Q2.
How many neutrons are in a carbon-14 atom?
Numerical answer · Easy
Q3.
The atomic number of oxygen is:
Multiple choice · Beginner
Q4.
Isotopes of the same element have the same number of protons.
True / False · Beginner
Q5.
The mass number of an atom equals the number of:
Multiple choice · Easy
Q6.
How many electrons does a neutral calcium atom (Z = 20) have?
Numerical answer · Easy
Q7.
A neutral atom always has equal numbers of protons and electrons.
True / False · Beginner
Q8.
Which of these species has exactly 10 electrons?
Multiple choice · Easy