CHM MIDTERM PART 2

Elements are defined by the number of ___________________________.

• a. protons

• b. neutrons

• c. electrons

Isotopes are defined by the number of ___________________________.

• a. protons

• b. neutrons

• c. electrons

Ions are defined by the number of ___________________________.

• a. protons

• b. neutrons

• c. electrons

Which of the following diagrams correctly shows the electron configuration of Sulfur, with atomic number 16?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

1. What is the maximum number of electrons that can occupy the 3rd electron shell?

• a. two

• b. eight

• c. eighteen

• d. thirty-two

What is the correct Lewis Dot Diagram for a stable atom of carbon?

• A

• B

• C

• D

Which one of the followings is NOT CORRECT for isotope atoms?

• They are atoms of the same element.

• They have same number of protons.

• They have same mass numbers.

• They have same atomic numbers.

Which one of the following expressions is INCORRECT?

• Electrons are negatively charged particles in an atom.

• Protons are found in the nucleus.

• Neutrons have positive electric charge.

• D. neutral atom has equal number of electrons and protons

What is the electric charge of this atom?

• +7

• +1

• -1

• -5

Which one of the followings is correct for a negatively charged ion?

• It has more protons than electrons.

• It has equal number of electrons and protons.

• It has more electrons than protons.

• D. It has more protons than neutrons.