Top 10 Missed Questions | Atoms Test

Most of the mass of an atom is occupied by:

• neutrons

• empty space

• a gas

• the nucleus

How many neutrons does an atom of uranium-238 have?

• 146.00

• 15

• 100

• 164

An atom has 13 protons and 14 neutrons. How many electrons are in the atom?

• 13

• 31

• 310

• 14

An element can be identified by its unique number of –

• Protons

• Neutrons

• Electrons

• Atomic Mass

What is the relationship between the atomic number and the proton number of a neutral atom?

• The atomic number minus the proton equals the mass number.,

• The atomic number always equals the proton number in an atom.

• The atomic number is greater than the proton number.

• There is no relationship.

An element's atomic number refers to-

• the number of neutrons in its nucleus

• the number of other elements it will combine with

• the number of protons in its nucleus

• the number of electrons it has

Here is the symbol for copper. What is its mass? (Remember to round up).

• 29

• 10

• 12

• 64

Which of these can be found in the nucleus of an atom?

• electron cloud

• electrons

• orbital cloud

• neutrons

This is the periodic entry for the element Boron. What is the atomic mass of Boron? (Remember to round up).

• 11

• 5

• 15

• 6

The table provides information on four different elements. Which element has six protons in its nucleus?

• Beryllium

• Carbon

• Magnesium

• Oxygen