Elements

Question 1

What is the number at the end of an isotope’s name?

Revolt · Accepted Answer

mass number

Question 2

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 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

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

Revolt · Accepted Answer

silicon-32

Question 5

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

Revolt · Accepted Answer

isotopes

Question 6

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 7

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 8

The model below shows a carbide ion.

Revolt · Accepted Answer

remove 4 electrons

Elements Answers

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