Elements

Question 1

Which describes an atom that has fewer neutrons than protons and more electrons than protons?

Revolt · Accepted Answer

negative ion

Question 2

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron?

Revolt · Accepted Answer

energy

Question 3

Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained.

Revolt · Accepted Answer

They each have the same number of protons.

Question 4

The simple model below is a neutral magnesium (Mg) atom with the element’s most common mass number.

Revolt · Accepted Answer

It must lose two electrons and become an ion.

Question 5

The model below shows a calcium atom.

Revolt · Accepted Answer

8

Question 6

Which are different forms of an element that have different numbers of neutrons?

Revolt · Accepted Answer

isotopes

Question 7

A potassium atom (atomic number 19) loses an electron while forming a bond with another atom.

Revolt · Accepted Answer

It is a positive ion that has one less valence electron than a neutral potassium atom.

Question 8

If we have a sample of silicon (Si) atoms that has 14 protons, 14 electrons, and 18 neutrons

Revolt · Accepted Answer

silicon-32

Question 9

All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39.

Revolt · Accepted Answer

20

Question 10

One way in which elements differ from each other is the structure of the electron cloud in each element’s atoms. In an electron cloud, an electron that is farther away from the nucleus has

Revolt · Accepted Answer

a higher energy than an electron near the nucleus.

Elements Answers

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