P7 Summative Test 3 ALL ABOUT MATTER &ATOMS

A student receives a model of an atom that contains seven protons, neutrons, and electrons, and has an atomic mass of approximately 14. What procedure can the student use to identify the atom?

• The student can reference the periodic table and find the element that has an atomic number of 7, which represents the number of neutrons in the atom.

• The student can reference the periodic table and find the element that has an atomic number of 14, which represents the number of protons and neutrons in the atom.

• The student can reference the periodic table and find the element that has an atomic number of 14, which represents the number of electrons and neutrons in the atom.

• The student can reference the periodic table and find the element that has an atomic number of 7, which represents the number of protons in the atom.

Use this element from the periodic table to answer the question. A student constructs a model of atomic structure for the element nitrogen. What sub particles should be visible in the nucleus of the atom model?

• Seven neutrons and seven protons

• Seven protons only

• Seven electrons and seven neutrons

• Fourteen neutrons and seven protons

Protons and neutrons in the central core of the atom are held together by —

• strong nuclear force

• gravitational force

• electromagnetic force

• weak nuclear force

Which statement must be true for a stable nucleus to hold the protons and neutrons inside?

• The nuclear force must overcome the electromagnetic repulsion between protons.

• The nucleus must have more neutrons than protons.

• The attractive forces between electrons and protons must be small.

• The nuclear force must balance the repulsive forces between neutrons and protons.

Using the diagram, what amount of protons does an element of neon contain?

• 10

• 20

• 15

• 30

How many protons are in an atom of oxygen?

• 8

• 16

• 9

• 24

Fluorine has an atomic number of 9 and an atomic mass of 18.998. How many protons does an atom of fluorine have?

• 18

• 9

• 10

• 19

What does the nucleus of an atom contain?

• Protons and neutrons

• Protons and electrons

• Electrons and neutrons

• Protons only

The atomic mass of an element equals the number of —

• protons + neutrons

• electrons

• protons

• protons + electrons

Using the diagram pictured, how many protons would an atom of iodine contain?

• 53

• 127

• 74

• 21