Chemistry Chapter 3, 4 and 5 Review

Front

What is the atomic number of phosphorus (P)?

Back

15

Front

What does the average atomic mass of 30.97 amu for phosphorus indicate about the number of neutrons?

Back

Some atoms have 15 neutrons and some have 16 neutrons.

Front

What is the correct shell model for a magnesium atom?

Back

Magnesium has 12 electrons, arranged in 3 shells: 2 in the first shell, 8 in the second shell, and 2 in the third shell.

Front

What is the density of tin and aluminum?

Back

Tin: 7.3 g/cm³; Aluminum: 2.7 g/cm³.

Front

What can be said about the density of a tin can coated with aluminum?

Back

Its density is between 2.8 g/cm³ and 7.3 g/cm³.

Front

Which element has 16 electrons when neutral?

Back

Sulfur.

Front

Which substance is predicted to dissolve in water?

Back

MgO.

Front

What is the definition of atomic mass?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is the significance of the atomic number?

Back

It represents the number of protons in an atom and determines the element's identity.

Front

What is the difference between an atom and an ion?

Back

An atom is neutral, while an ion has a net charge due to the loss or gain of electrons.