Elements

Question 1

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 2

The model below shows a calcium atom.

Revolt · Accepted Answer

8

Question 3

The model below shows a carbide ion.

Revolt · Accepted Answer

remove 4 electrons

Question 4

Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?

Revolt · Accepted Answer

The liquid contains only one element.

Question 5

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 6

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

Revolt · Accepted Answer

silicon-32

Question 7

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.

Question 8

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

Revolt · Accepted Answer

18

Question 9

The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electrons?

Revolt · Accepted Answer

Ca+2

Question 10

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

Revolt · Accepted Answer

isotopes

Elements Answers

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