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

The second energy level holds a maximum of 8 electrons distributed across the 2s² and 2p⁶ subshells.

Question 2

Which element has the highest electronegativity on the Pauling scale?

Accepted Answer

Fluorine

Answer

Fluorine has the highest electronegativity (4.0 on the Pauling scale) of all elements.

Question 3

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

Accepted Answer

Polar covalent bond

Answer

A polar covalent bond results from unequal electron sharing due to an electronegativity difference between bonded atoms.

Question 4

Which quantum number determines the shape of an electron orbital?

Accepted Answer

Angular momentum quantum number (l)

Answer

The angular momentum quantum number (l) determines orbital shape, distinguishing s, p, d, and f orbitals.

Question 5

Which pair of atoms represents isotopes of the same element?

Accepted Answer

¹²C and ¹⁴C

Answer

¹²C and ¹⁴C are isotopes because both are carbon atoms (same proton count) but differ in neutron count.

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