Chemistry Midterm Practice

What type of element is a good conductor of heat & electric current?

• Non-metal
• Metal
• Neither
• Both

An element has an atomic number of 47. The number of protons and electrons in a neutral atom of the element are ___.

• 47 protons and 47 electrons

• 23 protons and 24 electrons

• 94 protons and 47 electrons

• 47 protons and 0 electrons

The sum of the protons and neutrons in an atom equals the ____.

• atomic number
• nucleus number
• atomic mass

In the isotope name carbon-14, what does the number 14 signify?

• the atomic number

• the mass number

• the number of neutrons

• the number of protons

Using the periodic table, determine the number of neutrons in Oxygen.

• 4
• 8
• 16
• 24

An atom has an atomic number of 82 and a mass number of 207. How many protons, electrons, and neutrons does it have?

• 82 protons, 82 electrons, 125 neutrons

• 125 electrons, 82 protons, 82 neutrons

• 207 neutrons, 82 protons, 125 electrons

• 125 neutrons, 207 protons, 82 electrons

If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?

• 1 and 2
• 3 and 4
• 1 and 4
• 2 and 3

What is the maximum number of d orbitals in a principal energy level?

• 1
• 2
• 3
• 5

What is the maximum number of orbitals in the p sublevel?

• 2
• 3
• 4
• 5

Which of the following represents the correct electron configuration for a potassium ion (K⁺)?

• 1s²2s²2p⁶3s²3p⁶

• 1s²2s²2p⁶3s²3p⁶4s¹

• 1s²2s²2p⁶3s²3p⁶3d¹

• 1s²2s²2p⁶3s²3p⁵