Ions and Isotopes

What is a common use of isotopes in scientific research?

• Isotopes are often used as tracers in biochemical and environmental studies.

• Isotopes are primarily used for dating ancient artifacts.

• Isotopes are mainly used to create new elements in laboratories.

• Isotopes are commonly used to enhance the flavor of food.

Can an atom have more neutrons than protons?

• No, atoms cannot have more neutrons than protons.

• Yes, many isotopes have more neutrons than protons, which can affect their stability.

• Only certain elements can have more neutrons than protons.

• Neutrons and protons must always be equal in an atom.

What is the significance of isotopes in medicine?

• Isotopes are used in medical imaging and treatment, such as radioactive isotopes in cancer therapy.

• Isotopes are primarily used for dating ancient artifacts.

• Isotopes have no significant role in modern medicine.

• Isotopes are only used in research laboratories.

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What is an isotope?

• Atoms of different elements with the same number of neutrons.

• Atoms of the same element with the same number of protons but different numbers of neutrons.

• Atoms that have the same mass number but different atomic numbers.

• Atoms that are chemically identical but have different electron configurations.

What happens to the properties of an atom when it becomes an ion?

• The properties remain unchanged as the atom retains its original structure.

• The properties change due to the alteration in the number of electrons, affecting reactivity and interaction with other atoms.

• The properties become more stable and less reactive than before.

• The properties are enhanced, making the atom more likely to bond with other atoms.

If an atom has 10 protons and 9 neutrons, what is its mass number?

• 18

• 19

• 20

• 21

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What is the difference between cations and anions?

• Cations are negatively charged ions, while anions are positively charged ions.

• Cations are positively charged ions (lost electrons), while anions are negatively charged ions (gained electrons).

• Cations and anions are both positively charged ions.

• Cations are neutral ions, while anions are positively charged ions.

What is an ion?

• An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

• A neutral atom that has an equal number of protons and electrons.

• A particle that is always positively charged regardless of electron loss or gain.

• A molecule that cannot conduct electricity in any state.

How do you calculate the mass number of an atom?

• By measuring the weight of the atom

• By adding the number of protons and neutrons in the nucleus

• By counting the number of electrons

• By dividing the atomic weight by the atomic number

What is the charge of a sodium ion (Na+) after it loses an electron?

• Negative (-) charge.

• Neutral charge.

• Positive (+) charge.

• Variable charge.