Atomic Structure Grade 7

What is a subatomic particle with a positive charge that is in the nucleus of an atom?

• neutron

• proton

• electron

• valence electron

What is the smallest unit of matter? It is composed of protons and neutrons, held together in the nucleus, and electrons around the nucleus in different electron orbitals, which form an electron cloud.

• cell

• nucleus

• atom

• electron

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What is a subatomic particle without an electric charge, located in the nucleus of an atom?

• neutron

• proton

• electron

• valence electron

What is a subatomic particle with a negative charge? It is found in the electron cloud surrounding the nucleus.

• neutron

• proton

• electron

• electron cloud

If the atomic number of an element is 17 and mass number is 35 then the number of neutrons are

• 35

• 17

• 18

• 52

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The number of electrons in an atom is equal to number of

• nucleons in a neutral atom

• neutrons in a neutral atom

• protons in a neutral atom

• none of the above

The charged particles are called

• Molecules

• Atom

• Ions

• None of above

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No: of protons in the nucleus of an atom is called

• Atomic Number

• Atomic mass

• Isotope

• Electronic configuration

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The nucleus of an atom is made of

• electrons and protons
• electrons and neutrons
• protons and neutrons
• empty space

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What are valence electrons?

• The total number of electrons in an atom

• The number of electrons in the outermost shell

• The number of electrons in the second shell

• The number of protons in the outermost shell

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NGSS.MS-PS1-1