What are the three main particles that make up an atom?

• Protons, Neutrons, Electrons

• Protons, Neutrons, Photons

• Electrons, Photons, Neutrons

• Protons, Photons, Electrons

What is the main feature of the Electron Cloud Model?

• Electrons are in fixed orbits.

• Electrons are likely to be found in clouds around the nucleus.

• Electrons move in a straight line.

• Electrons are stationary.

Which model is considered outdated and inaccurate?

• Electron Cloud Model

• Quantum Mechanical Model

• Bohr Model

• Rutherford Model

What does the atomic number of an element represent?

• Neutrons

• Electrons

• Protons

• Atomic mass

According to the Bohr model, how many electrons can occupy the first energy level?

• 2

• 8

• 18

• 4

What is a characteristic of non-metals?

• Lustrous

• Malleable

• Poor conductors

• Sonorous

Metalloids have properties of which of the following?

• Only metals

• Only non-metals

• Both metals and non-metals

• Neither metals nor non-metals

How does ionization energy change as you move across a period from left to right?

• It decreases

• It increases

• It remains constant

• It first increases then decreases

What happens to the atomic radius as you move down a group in the periodic table?

• It increases

• It decreases

• It remains the same

• It fluctuates

What happens to the atomic radius as you move across a period in the periodic table?

• It increases

• It decreases

• It remains the same

• It fluctuates