Understanding Atoms for Grade 10

What is the basic unit of matter?

• atom

• cell

• molecule

• compound

Define an atom and its components.

• An atom is a single particle without any subcomponents.

• Atoms are made up of molecules and compounds.

• An atom is made up of protons, neutrons, and electrons.

• An atom consists of only protons and electrons.

What is the charge of a proton?

• +1 elementary charge

• -1 elementary charge

• 0 elementary charge

• +2 elementary charge

How do neutrons differ from protons?

• Neutrons determine the chemical properties of an atom.

• Neutrons differ from protons in charge (neutrons are neutral, protons are positively charged), mass (neutrons are slightly heavier), and their role in determining atomic identity and stability.

• Neutrons are lighter than protons.

• Neutrons are positively charged like protons.

What is the significance of the atomic number?

• The atomic number indicates the mass of an element.

• The atomic number is significant because it defines the element and its properties.

• The atomic number is used to measure the temperature of an element.

• The atomic number determines the color of an element.

Explain the concept of isotopes.

• Isotopes are variants of elements with the same number of protons but different numbers of neutrons.

• Isotopes are elements that have the same atomic mass but different atomic numbers.

• Isotopes are identical elements that differ in their chemical properties.

• Isotopes are elements with different numbers of protons and neutrons.

What is the role of electrons in an atom?

• Electrons are responsible for the chemical behavior of atoms and form bonds with other atoms.

• Electrons are only involved in nuclear reactions.

• Electrons are the heaviest particles in an atom.

• Electrons determine the mass of an atom.

Describe the structure of the atomic nucleus.

• The atomic nucleus consists only of protons, with no neutrons present.

• The atomic nucleus is a dense core made of protons and neutrons, held together by the strong nuclear force.

• The atomic nucleus is primarily composed of electrons and photons.

• The atomic nucleus is a hollow structure filled with gas.