GCSE Chemistry - Atoms & Ions #1

What is the basic structure of an atom?

• Central nucleus surrounded by electrons

• Central nucleus surrounded by protons

• Central nucleus surrounded by neutrons

• Central nucleus surrounded by positrons

What are the two types of particles in the nucleus of an atom?

• Protons and electrons

• Neutrons and electrons

• Neutrons and positrons

• Protons and neutrons

What is the relative mass of protons and neutrons?

• Protons are heavier than neutrons

• Protons and neutrons have no mass

• Protons and neutrons have the same mass

• Neutrons are heavier than protons

What is the charge of protons?

• Positive

• Negative

• Variable

• Neutral

What is the charge of neutrons?

• Variable

• Neutral

• Negative

• Positive

What is the charge of electrons?

• Positive

• Negative

• Neutral

• Variable

What happens to an atom when it loses or gains electrons?

• It becomes a molecule

• It becomes a compound

• It becomes a mixture

• It becomes an ion

What does the atomic number of an element represent?

• Number of shells

• Number of electrons

• Number of protons inside the nucleus

• Number of neutrons

What does the mass number of an element represent?

• Number of shells

• Number of protons inside the nucleus

• Number of electrons and protons of an atom

• Number of neutrons and protons inside the nucleus

How many protons does an oxygen atom have?

• 6

• 7

• 9

• 8