Test 3

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Why are the atomic masses listed in the periodic table not whole numbers?

The atomic masses are average atomic masses

Which of these photons has the greatest energy?

Ultraviolet

Each spectral line in a spectrum represents

a specific frequency of light emitted by an element

Any material that is made up of only one type of atom is classified as

an element.

Atoms are best described using

conceptual models.

When an atom is excited, its

electrons are boosted to higher energy levels

Excitation is the process whereby

electrons are boosted to higher energy levels in an atom

The most abundant element in the universe is

hydrogen

What is known about atoms is that they are

mostly empty space

The mass number of an element refers to the number of

nucleons in its nucleus

How can a hydrogen atom , which has only one electron , have so many spectral lines?

one electron can be boosted to many different energy levels

In an electrically neutral atom, the number of protons in the nucleus is balanced by an equal number of

orbital electrons

A quantum of light is called a

photon

The atomic number of an element matches the number of

protons in the nucleus of an atom.

The shell model of the atom views electrons as occupying

shells

The origin of the elements is

the stars

The lanthanides are much like a group of elements because

they share similar properties

Electrons in the outermost shells of atoms are called

valence electrons

In the relationship E ∼ ƒ, E stands for energy, and ƒ stands for

wave frequency, as defined for sound, radio, and light waves

Which of the following is a quantum number?

1

How many groups are there in the periodic table?

Eighteen

Helium, He, is a nonmetallic gas and the second element in the periodic table. Rather than being placed adjacent to hydrogen, H, however, helium is placed on the far right of the table. Why?

Helium is most similar to other group 18 elements

Which of the following particles are electrically neutral?

Neutron

Which has less energy per photon?

Red light


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