QUIZ 2.1 - CHEMICAL BONDING

Valence electrons are the ________

• number of electrons lost

• number of electrons gained

• electrons in the innermost energy level of an atom

• electrons in the outermost energy level of an atom

Structures atoms and molecules whose valence electrons are represented by dots are known as ________ structures

• Arrhenius

• Brönsted

• Lewis

• Lowry

Which pair of elements can combine to form ionic bonds?

• H and Cl

• H and N

• S and Sr

• Xe and F

A positive ion is known as a/an ________

• anion

• cation

• proton

• electron

The bond formed by transfer of electrons is known as _____ bond

• covalent

• dative

• ionic

• metallic

Which of the following statement is incorrect?

• All elements in the second period of the periodic table contain two valence electrons.

• Electron configurations may be used to determine the number of valence electrons of an element.

• In the periodic table, the number of valence electrons determines the group placement of an element.

• The number of valence electrons of the representative elements is equal to the total number of electrons in the outermost shell.

What will happen if argon (Ar) and barium (Ba) are made to react?

• Ba will gain electrons.

• Ar will lose electrons.

• Ba and Ar will share electrons.

• Ba and Ar will not form a compound.

Which of the following particles are shared or transferred during compound formation?

• electrons

• ions

• neutrons

• protons

How many electrons are in the outermost shell of bonded atoms that follow the octet rule?

• two

• four

• six

• eight

Which of the following pairs of elements and valence electrons is incorrect?

• Al – 3

• Br – 7

• S – 4

• Sr - 2