MTTC MTTC Chemistry

Question 1

What is the maximum number of electrons that can occupy the second energy level (n=2) of an atom?

Accepted Answer

8

Answer

2

Answer

18

Answer

32

Question 2

Which element has the highest electronegativity on the Pauling scale?

Accepted Answer

Fluorine

Answer

Oxygen

Answer

Chlorine

Answer

Nitrogen

Question 3

What type of bond forms when electrons are shared unequally between two atoms of different electronegativities?

Accepted Answer

Polar covalent bond

Answer

Ionic bond

Answer

Nonpolar covalent bond

Answer

Metallic bond

Question 4

Which quantum number determines the shape of an electron orbital?

Accepted Answer

Angular momentum quantum number (l)

Answer

Principal quantum number (n)

Answer

Magnetic quantum number (ml)

Answer

Spin quantum number (ms)

Question 5

Which pair of atoms represents isotopes of the same element?

Accepted Answer

¹²C and ¹⁴C

Answer

¹²C and ¹⁴N

Answer

¹H and ²He

Answer

¹⁶O and ³²S

Question 6

What is the correct electron configuration for a neutral iron atom (Fe, atomic number 26)?

Accepted Answer

[Ar] 3d⁶ 4s²

Answer

[Ar] 3d⁸

Answer

[Kr] 3d⁶ 4s²

Answer

[Ar] 4d⁶ 4s²

Question 7

Which statement best describes the trend in atomic radius across a period (left to right) in the periodic table?

Accepted Answer

Atomic radius decreases because nuclear charge increases without adding new energy levels

Answer

Atomic radius increases because more protons are added

Answer

Atomic radius stays constant across a period

Answer

Atomic radius increases because more electrons are added to outer shells