11th grade 2nd term Q2 chemical bonding II SEK

We studied three relations between variables regarding electronegativity (x):

Key:

ec = electronic configuration; z = atomic number; r = atomic radius

• x - r: if r grows, x grows

• x - r: if r grows, x decreases

• x - ec: if ec needs many electrons to reach an octet, x decreases

• x - z: if z grows, x decreases

• x - z: if z grows, x grows

Put these in increasing order of atomic radius

C, H, O

• H < C < O

• H < O < C

• O < C < H

• C < H < O

Which one(s) of the following substances aren't likely to be found

• Mg₂O₃ (Mg = Mg⁺³, O = O^-2)

• H₃O (H=⁺¹, O = ^-3)

• Si₂F₃ (Si = Si⁺³, F=F^-2)

• MgO (Mg = Mg⁺², O = O^-2)

• NCl₃ (N = N⁺³, Cl = Cl^-)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which category of elements usually form negative ions?

• metals

• nonmetals

• metalloids

• noble gases

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following ions has reached an octet in its ve level

• Br^-

• Na⁺

• Be⁺¹

• I⁺

• O^-2

All chemical bonds involve two atoms sharing electrons.

• True
• False

This sketch shows the atomic radius trends in the periodic table. Select the correct option

• Atomic radius is correct, because it grows to the left and downward.

• Atomic radius is wrong, as it grows to the right and downward.

• Atomic radius is wrong, because it grows from left to right.

• Atomic radius is wrong, because it grows from bottom to top.

Ionic bonding is between a

• nonmetal and nonmetal

• metal and nonmetal

• metal and metal

• Depends on the situation

Tags

NGSS.HS-PS1-2

CaCl₂ is an example of what type of bond?

• Covalent

• Metallic

• Ionic

Tags

NGSS.HS-PS1-1

In chemical compounds, covalent bonds form when

• the electronegativity difference between two atoms is very large.
• electrons are completely transferred between two metals.
• pairs of electrons are shared between two nonmetal atoms.
• two nonmetal atoms are attracted to each other by opposite charges.