Chemistry: Atoms & the Periodic Table

Question 1

What is the chemical symbol for gold?

A Go B Gd C Au D Ag

💡 Explanation

Au is correct because it comes from the Latin name for gold, 'aurum'.

Question 2

Which particle in an atom carries a negative charge?

A Proton B Neutron C Electron D Nucleus

💡 Explanation

Electron is correct because electrons carry a negative electrical charge.

Question 3

What is the most abundant gas in Earth's atmosphere?

A Oxygen B Carbon dioxide C Nitrogen D Hydrogen

💡 Explanation

Nitrogen is correct because it makes up about 78% of Earth's atmosphere.

Question 4

The pH value of a neutral solution at 25°C is:

A 0 B 7 C 14 D 1

💡 Explanation

7 is correct because a neutral solution has a pH of 7 on the 0–14 scale.

Question 5

Water is composed of hydrogen and which other element?

A Nitrogen B Carbon C Oxygen D Helium

💡 Explanation

Oxygen is correct because water's formula H₂O contains two hydrogen atoms and one oxygen atom.