Periodic Table unit 5 Review

Argon has an atomic number of 18 and a mass number of 40. How many protons does a typical argon atom have?

• 18
• 22
• 40
• 58

A typical atom of sodium has 11 protons, 12 neutrons, and 11 electrons. What is the mass number of sodium?

• 1
• 11
• 12
• 23

How are elements arranged in the periodic table?

• in alphabetical order
• in the order in which they were discovered
•  in order of increasing atomic number
•  in order of increasing melting points

The vertical columns in the periodic table are known as:

• groups
• periods
• valences
• isotopes

Iron has an atomic number of 26 and a mass number of 56. How many neutrons are in the nucleus of a typical iron atom?

• 26
• 30
• 56
• 82

Group 18 of the periodic table contains nonreactive elements like helium, neon, and argon. The elements in this group are called:

• alkali metsls
• transition metals
• halogens
• noble gases

Use the periodic table to answer the question.
Which element listed below is a nonmetal?

•  sodium (Na)
•  magnesium (Mg)
• iron (Fe)
•  chlorine (Cl)

The horizontal rows of the periodic table are known as:

• periods
• groups
• columns
• isotopes

 In their outermost energy levels, sodium has 1 electron, carbon has 4 electrons, fluorine has 7 electrons, and neon has 8 electrons. Which element is the least reactive?

• sodium
• carbon
• fluorine
• neon

 Use the periodic table to answer the question.
Out of all the lists below, which list contains the three elements that are most alike in their chemical properties?

• O, F, Ne
• Li, Mg, Sc
• Li, Na, K
• H, He, Li