Exploring Chemistry Fundamentals

What is the charge of a proton?

• 0 elementary charge

• +2 elementary charge

• -1 elementary charge

• +1 elementary charge

Define the term 'atomic number'.

• The atomic number represents the mass of an atom in atomic mass units.

• The atomic number is the total number of electrons in an atom.

• The atomic number is the sum of neutrons and protons in an atom.

• The atomic number is the number of protons in the nucleus of an atom.

What is the maximum number of electrons in the second shell?

• 6

• 8

• 10

• 4

Explain the difference between ionic and covalent bonds.

• Covalent bonds are stronger than ionic bonds due to the transfer of electrons.

• Ionic bonds involve sharing electrons, while covalent bonds involve attraction between ions.

• Ionic bonds involve electron transfer and attraction between ions, while covalent bonds involve electron sharing between atoms.

• Ionic bonds are formed only in metals, while covalent bonds are formed in non-metals.

What is the octet rule?

• The octet rule states that atoms seek to have eight electrons in their valence shell.

• Atoms can have any number of electrons without restrictions.

• Atoms prefer to have six electrons in their valence shell.

• The octet rule applies only to metals.

Describe the trend in atomic radius across a period.

• The atomic radius decreases across a period.

• The atomic radius fluctuates randomly across a period.

• The atomic radius remains constant across a period.

• The atomic radius increases across a period.

What is electronegativity and how does it vary in the periodic table?

• Electronegativity increases across a period and decreases down a group in the periodic table.

• Electronegativity is only relevant for noble gases.

• Electronegativity is constant across the periodic table.

• Electronegativity decreases across a period and increases down a group.

Identify the element with the highest electronegativity.

• Fluorine

• Carbon

• Oxygen

• Nitrogen

What is the significance of the valence electrons in chemical bonding?

• Valence electrons are significant in chemical bonding because they determine how atoms interact and bond with each other.

• Valence electrons are only important in ionic compounds.

• Valence electrons only affect the mass of an atom.

• Valence electrons are irrelevant in chemical reactions.

How do metals and nonmetals differ in terms of electron affinity?

• Metals have lower electron affinity than nonmetals.

• Metals and nonmetals have the same electron affinity.

• Nonmetals have lower electron affinity than metals.

• Metals have higher electron affinity than nonmetals.