Chemistry Quiz _Try1

Chlorine has an atomic number of 17 and a mass number of 35. It has .....

• 17 protons, 17 electrons, and 18 neutrons.

• 17 protons, 17 electrons, and 52 neutrons.

• 35 protons, 35 electrons, and 17 neutrons.

• 18 protons, 18 electrons, and 17 neutrons.

Answer explanation

Chlorine has an atomic number of 17, which represents the number of protons and electrons. The correct choice has 17 protons and 17 electrons. The mass number of 35 indicates the sum of protons and neutrons, so the correct choice also has 18 neutrons.

Which of the following atoms has the highest ionization energy?

• Si

• P

• Al

• S

Answer explanation

The atom with the highest ionization energy is S because it has the strongest attraction for its valence electrons.

What element has the electron configuration 1s² 2s² 2p 3s² 3pº 4s² 3d¹⁰ 4p5?

• Se

• Br

• I

• Cl

Answer explanation

The electron configuration 1s² 2s² 2p 3s² 3pº 4s² 3d¹⁰ 4p5 corresponds to the element Br (Bromine).

The electrons available to be lost, gained, or shared when atoms form molecules are called

• electron clouds

• d electrons

• ions

• valence electrons

Answer explanation

Valence electrons are the electrons available to be lost, gained, or shared when atoms form molecules.

An atom is electrically neutral because ..............

• The number of protons and neutrons are equal

• Neutrons balance the protons and electrons

• The number of protons and electrons are equal

• Valence electrons balance the nuclear forces

Answer explanation

An atom is electrically neutral because the number of protons and electrons are equal.

How many protons, electrons, and neutrons, respectively, does Sn have?

• 50, 50, 119

• 50, 50, 69

• 69, 50, 119

• 50, 69, 50

Answer explanation

Sn, also known as tin, has 50 protons, 50 electrons, and 69 neutrons. This is the correct choice as it matches the atomic number and mass number of Sn.

Which of the following is ranked in order of largest to smallest atomic radius?

• Cr > Cs > F > S > Ge

• F>S> Ge > Cr > Cs

• Cs > Cr > Ge > S > F

• Cs > Ge> Cr > F > S

Answer explanation

The correct order of atomic radius from largest to smallest is Cs > Cr > Ge > S > F.

The element that has the greatest electronegativity is

• fluorine

• oxygen

• sodium

• chlorine

Answer explanation

Fluorine has the highest electronegativity among the given elements. It attracts electrons more strongly than any other element, making it the most electronegative.

Which element has the electron configuration [Ar] 4s² 3d¹⁰ ?

• Ca

• Ni

• Ga

• Zn

Answer explanation

The element with the electron configuration [Ar] 4s² 3d¹⁰ is Zn. Zn is the correct choice because it has 30 electrons, with 2 in the 4s orbital and 10 in the 3d orbital.

 Which of the following atoms has the highest ionization energy?

• Br

• I

• Cl

• Se

Answer explanation

The atom with the highest ionization energy is Cl, as it requires the most energy to remove an electron from its outer shell.