Chemistry Review

Which of these atoms is electrically neutral?

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Which of the following are found in the nucleus of an atom?

• neutrons and elements

• electrons and protons

• neutrons and protons

• protons and electrons

According to the periodic table, how many neutrons does one atom of Boron contain?

• 13

• 6

• 5

• 11

Which of the following explains why this atom is Fluorine? Use the diagram below to answer the question.

• There are 10 neutrons.

• There are 9 protons.

• The mass is 19.

• There are 7 valence electrons.

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element best fits this description?

• Nitrogen (N)

• Arsenic (As)

• Sulfer (S)

• Silicon (Si)

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

• H₃PO₄

• HCIO₃

• H₂SO₄

• H₂O

Jordan built a model of a neutral helium atom. What change would fix the mistake in Jordan's model?

• swap the labels for the electron and nucleus

• swap the labels for the proton and neutron

• swap the labels for the electron and neutron

• swap the labels for the proton and nucleus

How many electrons does a neutral atom with 15 protons have?

The periodic table is divided into groups. In general, —

• the groups are based on the number of neutrons in the nucleus.

• the groups are based only on atomic numbers.

• elements in one group do not tend to bond with elements in other groups.

• elements that belong to the same group tend to have similar chemical proper

On the periodic table, the elements in the groups have the same number of —

• protons in their outer shells.

• neutrons.

• electrons in their outer shells.

• electrons.