Physical Science Redemption Midterm

1) Which of the following is TRUE about the nucleus of an atom?

• It contains the protons and neutrons

• 50% of the atom’s mass is located there
• It has a negative charge

2) What is the atomic mass of the atom shown?

• 3
• 4
• 7
• 10

3) What is the mass of an atom that contains 10 protons, 11 neutrons, and 10 electrons?

• 10
• 20
• 21
• 31

4) How many electrons does an atom of fluorine (F) have?

• 9
• 32
• 19
• 20

An atom of Sodium (Na) has (a)   protons.

• 11 protons
• 12
• 16
• 37

6) What are atoms of the same element that have different numbers of neutrons called?

• Isotopes
• Neutrons
• Metals
• Metalloids

7) Which of the following statements is true about ions?

• Positive ions form when an atom gains electrons
• Negative ions form when an atom gains protons
• Negative ions form when an atom loses protons
• Positive ions form when an atom loses electrons

8) Which of the following would be an isotope of silicon (14 protons, 14 neutrons, 14 electrons)

• Silicon (14 protons, 15 neutrons, 15 electrons)
• Silicon (15 protons, 14 neutrons, 15 electrons)
• Silicon (14 protons, 15 neutrons, 14 electrons)
• Silicon (15 protons, 15 neutrons, 15 electrons)

9) Which of the following correctly describes the charge and the name of the particles in an atom?

• A negative electron, B positive neutron, C neutral proton
• A negative electron, B positive proton, C neutral neutron
• A positive proton, B negative electron, C neutral neutron

10) Order these elements from LEAST to GREATEST atomic MASS

• Li, He, N, S
• He, Li, N, S
• N, He, Li, S3