Question 1

As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the

Accepted Answer

electronegativity

Answer

number of electron shells

Answer

number of electrons in the fi rst shell

Answer

atomic radius

Question 2

Which element is classified as a metalloid?

Accepted Answer

boron

Answer

potassium

Answer

sulfur

Answer

xenon

Question 3

Strontium and barium have similar chemical properties because atoms of these elements have the same number of

Accepted Answer

valence electrons

Answer

protons

Answer

electron shells

Answer

neutrons

Question 4

Which term represents the fixed proportion of elements in a compound?

Accepted Answer

chemical formula

Answer

density formula

Answer

molar mass

Answer

atomic mass

Question 5

Which two terms represent types of chemical formulas?

Accepted Answer

molecular and structural

Answer

mechanical and structural

Answer

mechanical and thermal

Answer

molecular and thermal

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