Atoms

Who discovered the Neutron?

• Dalton

• J J Thompson

• Chadwick

• Daraday

Phrase equivalent in meaning to the phrase "have the same number of protons in the nucleus"

• have the same nuclear mass

• have the same nuclear mass

• have the same nuclear charge

• have the same number of neutrons

What is the atomic number of an atom equal to?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The number of electrons

• The numbers of protons and neutrons in the nucleus

What is the centre of an atom called?

• The Protons

• The Electrons

• The Neutrons

• The Nucleus

An atom has an atomic number of 9 and a mass number of 19. What are its number of protons, neutrons and electrons?

• Protons = 10, Neutrons=19, Electrons=10

• Protons = 9, Neutrons=10, Electrons=9

• Protons = 19, Neutrons=10, Electrons=19

• Protons = 10, Neutrons=9, Electrons=10

The identity of a chemical element is determined by which of the following?

• The number of protons it possesses

• The number of neutrons it possesses

• The number of electrons it possesses

• The sum of the number of protons and neutrons it possesses.

Atom has 13 protons and 14 neutrons. What is its mass number?

• 14

• 27

• 13

• 40

How many neutrons does this atom of oxygen have?

• 16

• 32

• 24

• 8

An atom of sodium has an atomic number of 11 and a mass number of 23. Which of the following statements is correct?

• An atom of sodium has 11 protons, 11 electrons, and 12 neutrons.

• An atom of sodium has 11 protons, 11 electrons, and 11 neutrons.

• An atom of sodium has 11 protons, 12 electrons, and 11 neutrons.

• An atom of sodium has 11 protons, 12 electrons, and 12 neutrons.

The particles in an atom that are neutral and have no charge are...