Unit 3

Front

Which electromagnetic waves have the highest frequencies and the shortest wavelengths?

Back

gamma rays

Answer explanation

Gamma rays have the highest frequencies and the shortest wavelengths in the electromagnetic spectrum, surpassing microwaves and visible light, making them the correct answer.

Front

Which electromagnetic waves are used in ovens and cell phone communications?

Back

microwaves

Answer explanation

Microwaves are the electromagnetic waves used in ovens to heat food and in cell phone communications for transmitting signals. They are effective at penetrating materials, making them ideal for these applications.

Front

How much of the electromagnetic spectrum is made up of visible light?

Back

only a small portion

Answer explanation

Visible light constitutes only a small portion of the electromagnetic spectrum, which includes a wide range of wavelengths from radio waves to gamma rays. Thus, the correct answer is 'only a small portion'.

Front

List the electromagnetic waves in order of decreasing frequency: X-rays, microwaves, infrared rays; UV rays, visible light, x-rays; infrared rays, microwaves, radio waves.

Back

infrared rays, microwaves, radio waves

Answer explanation

Electromagnetic waves are ordered by frequency from highest to lowest as follows: X-rays, UV rays, visible light, infrared rays, microwaves, and radio waves. Thus, the correct order is infrared rays, microwaves, radio waves.

Front

Valence electron

Back

Electrons in the outer shell

Answer explanation

Valence electrons are the electrons located in the outermost shell of an atom. They play a crucial role in chemical bonding and reactions, making the correct choice "Electrons in the outer shell".

Front

The innermost energy level has a maximum of how many electrons?

Back

2

Answer explanation

The innermost energy level, also known as the first shell, can hold a maximum of 2 electrons. This is due to the formula 2n², where n is the energy level number. For n=1, 2(1)² = 2.

Front

What does the Bohr Model represent?

Back

The structure of an atom

Answer explanation

The Bohr Model represents the structure of an atom, specifically how electrons orbit the nucleus in defined energy levels, similar to planets orbiting the sun in the Solar System.

Front

Which element is this?

Back

Neon

Answer explanation

The correct answer is Neon, which is a noble gas with the atomic number 10. It is colorless, odorless, and inert, distinguishing it from the other options like Nickel, Sodium, and Nitrogen.

Front

What atom matches this electron configuration? 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

Back

Zinc

Answer explanation

The electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ corresponds to Zinc, which has an atomic number of 30. This configuration indicates a complete filling of the 3d subshell and the 4s subshell, characteristic of Zinc.

Front

What electron configuration matches an oxygen atom?

Back

1s²2s²2p⁴

Answer explanation

An oxygen atom has 8 electrons. Its electron configuration is 1s² 2s² 2p⁴, which accounts for all 8 electrons. The other options either exceed the number of electrons or represent different elements.