Which type of charge does an electron carry?

• Positive

• Both positive and negative

• Neutral

• Negative

Answer explanation

An electron carries a negative charge. This is a fundamental property of electrons, distinguishing them from protons, which have a positive charge, and neutrons, which are neutral.

Which type of charge does a proton carry?

• Both positive and negative

• Negative

• Neutral

• Positive

Answer explanation

A proton carries a positive charge. This is a fundamental property of protons, distinguishing them from electrons, which have a negative charge, and neutrons, which are neutral.

Which type of charge does a neutron carry?

• Positive

• Negative

• Both positive and negative

• Neutral

Answer explanation

A neutron carries no charge, making it neutral. Unlike protons, which have a positive charge, and electrons, which have a negative charge, neutrons are essential for the stability of atomic nuclei.

The atomic number is the number of ____ in an atom.

• electrons

• neutrons

• protons

• energy levels

Answer explanation

The atomic number represents the number of protons in an atom. Protons are positively charged particles found in the nucleus, and the atomic number defines the identity of an element.

What is the name of the outermost ring of electrons in an atom?

• orbital

• conduction band

• energy level

• valence shell

Answer explanation

The outermost ring of electrons in an atom is called the valence shell. It contains the valence electrons, which are important for chemical bonding and reactions.

What is the maximum number of electrons that can fit in an atom’s outermost orbit?

• 2

• 6

• 8

• 18

Answer explanation

The maximum number of electrons in an atom's outermost orbit, or valence shell, is 8, following the octet rule. This allows for stable electron configurations, making 8 the correct answer.

Copper is an example of a _____.

• conductor

• insulator

• semiconductor

• resistor

Answer explanation

Copper is an example of a conductor because it allows electric current to flow through it easily due to its free electrons. This property makes it ideal for electrical wiring and components.

Rubber is an example of a _____.

• conductor

• insulator

• semiconductor

• electrolyte

Answer explanation

Rubber is an insulator because it does not conduct electricity well. Unlike conductors, which allow electric current to flow freely, insulators like rubber prevent the flow of electricity, making them useful for protecting against electric shock.

Voltage is measured in _____.

• volts (V)

• amperes (A)

• ohms (Ω)

• watts (W)

Answer explanation

Voltage is the measure of electric potential difference and is expressed in volts (V). The other options refer to different electrical concepts: amperes (A) for current, ohms (Ω) for resistance, and watts (W) for power.

Current is measured in _____.

• watts (W)

• volts (V)

• amperes (A)

• ohms (Ω)

Answer explanation

Current is measured in amperes (A), which quantifies the flow of electric charge. Watts (W) measure power, volts (V) measure voltage, and ohms (Ω) measure resistance, making amperes the correct unit for current.