Electrons

In the electron cloud model of the atom, what does the cloud represent?

• the limits of the electron location

• the probability of the electron location

• the average distance between the electron and the nucleus

• the minimum distance between the electron and the nucleus

Light is emitted when electrons

• move from one atom to another.

• collide with one another, releasing energy.

• move from a lower energy level to a higher energy level.

• move from a higher energy level to a lower energy level.

Tags

NGSS.HS-PS4-3

Flame tests can be used to identify an element. Each element emits characteristic waves of light when it is heated in a flame. What describes how the light is produced?

• Protons in the ground state lose energy and give off light.

• Protons in the ground state gain energy and are emitted from the nucleus, giving off light.

• Electrons in the ground state lose energy and move to an excited state, giving off light.

• Electrons in the ground state gain energy, move to an excited state, and give off light when they return to the ground state.

Tags

NGSS.HS-PS4-3

Which occurs if an electron transitions from n = 5 to

n = 2 in a hydrogen atom?

• Energy is absorbed, and visible light is emitted.

• Energy is released, and visible light is emitted.

• Energy is released, and visible light is not emitted.

• Energy is absorbed, and visible light is not emitted.

Tags

NGSS.HS-PS4-3

In a stable atom the amount of electrons is electron is equal to

• neutrons
• protons
• atomic mass
• neutrons + protons

Tags

NGSS.MS-PS1-1

What is the charge of the electron

• positive
• no charge
• negative
• neutral

How many electrons does an atom with 8 protons have?

• 8
• 16
• 15.99
• 24

Tags

NGSS.HS-PS1-1

The first orbital can hold a maximum of how many electrons?

• 2
• 3
• 8
• 6

Which of the following elements has 18 electrons?

• Flourine
• Helium
• Argon
• Chlorine

Tags

NGSS.HS-PS1-1

How many electrons are in the outer shell of Sodium?

• 1
• 8
• 2

Tags

NGSS.HS-PS1-1