WorksheetsExploring Valence Electrons and Valency
Total questions: 20
Worksheet time: 10mins
What are valence electrons?
Electrons that are responsible for the mass of an atom.
Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.
Electrons that are involved in thermal conductivity.
Electrons that are only found in the nucleus of an atom.
How many valence electrons does carbon have?
6
2
8
4
Define valency in terms of chemical bonding.
Valency is the measure of an atom's ability to bond with other atoms, based on its electron configuration.
Valency is the temperature at which a substance changes state.
Valency refers to the mass of an atom in grams.
Valency is the total number of protons in an atom.
What is the valency of sodium?
0
1
3
2
How do you calculate the valency of an element?
Valency is the total number of protons in an atom.
Valency is calculated based on the number of electrons in the outer shell of an atom.
Valency is determined by the atomic mass of an element.
Valency is calculated by the number of neutrons in the nucleus.
What is the atomic number of oxygen?
12
8
10
6
Explain the relationship between atomic number and electrons.
The atomic number is the total number of protons in an atom.
The atomic number is equal to the number of electrons in a neutral atom.
Electrons are not related to the atomic number in any way.
The atomic number is equal to the number of neutrons in a neutral atom.
How many protons are in an atom with atomic number 12?
12
8
14
10
What is the valency of chlorine in NaCl?
-2
+1
-1
0
How does the number of valence electrons affect an element's reactivity?
Elements with more valence electrons are always less reactive.
Valence electrons have no impact on an element's reactivity.
The number of protons determines reactivity, not valence electrons.
The number of valence electrons affects an element's reactivity by influencing its ability to gain, lose, or share electrons.
What is the atomic number of hydrogen?
0
1
3
2
How many valence electrons does nitrogen have?
3
5
7
4
What is the significance of valency in forming compounds?
Valency is irrelevant in compound formation.
Valency determines the temperature of compounds.
Valency only affects the color of compounds.
Valency is significant as it determines how atoms bond and combine to form stable compounds.
Calculate the valency of magnesium.
1
3
4
2
What is the atomic number of carbon?
5
7
12
6
How many valence electrons does a noble gas have?
4
6
10
8 (or 2 for helium)
What is the valency of sulfur in H2SO4?
6
4
2
8
How do you determine the valency of transition metals?
Transition metals do not have a valency as they are inert.
The valency of transition metals is determined by their oxidation states, which can vary due to the involvement of d-orbitals.
Valency is determined solely by the number of protons in the nucleus.
The valency of transition metals is fixed and does not change.
What is the relationship between valency and the periodic table?
Valency is the same for all elements regardless of their group.
Valency is determined solely by an element's atomic mass.
Valency has no relation to an element's position in the periodic table.
Valency is related to an element's group number in the periodic table, influencing its bonding behavior.
Provide an example of a compound and its valency.
Carbon Dioxide (CO2) - Carbon (valency 4), Oxygen (valency 2)
Ammonia (NH3) - Nitrogen (valency 3), Hydrogen (valency 2)
Water (H2O) - Hydrogen (valency 1), Oxygen (valency 2)
Sodium Chloride (NaCl) - Sodium (valency 1), Chlorine (valency 3)
