Atoms and the Periodic Table: Key Concepts and Calculations

What does the atomic number of an element represent?

• Number of protons

• Number of electrons in a charged atom

• Number of neutrons

• Number of electron shells

What information does the element box on the periodic table provide?

• Chemical reactivity

• Isotopic composition

• Electron configuration

• Atomic number, atomic mass, and atomic symbol

What is the atomic symbol for sodium?

• Na

• Sd

• So

• Sn

What is the atomic symbol for chlorine?

• Ch

• Ci

• Cl

• C

How is the atomic mass of an element calculated?

• Number of protons plus electrons

• Number of neutrons minus protons

• Number of protons minus neutrons

• Number of protons plus neutrons

How many neutrons does fluorine have?

• 10

• 19

• 9

• 18

What is the significance of the atomic number in a neutral atom?

• It is unrelated to subatomic particles

• It equals the number of protons and electrons

• It equals the number of neutrons

• It equals the number of electrons only

What is the atomic mass of an element primarily composed of?

• Electrons and protons

• Protons and neutrons

• Neutrons and isotopes

• Protons and isotopes

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How many protons does beryllium have?

• 9

• 2

• 5

• 4

In a neutral atom of beryllium, how many electrons are present?

• 2

• 4

• 5

• 9