Atoma

Silicon has a mass number of 28 and an atomic number of 14. How many protons does it have?

• 28

• 14

• 42

• 7

Tags

NGSS.MS-PS1-1

What is the basic unit of matter?

• Atom

• Molecule

• Compound

• Element

Tags

NGSS.MS-PS1-1

Which subatomic particle has a positive charge?

• Electron

• Proton

• Neutron

• Photon

What is the center of an atom called?

• Nucleus

• Electron cloud

• Proton

• Neutron

Which subatomic particle orbits the nucleus of an atom?

• Proton

• Neutron

• Electron

• Photon

What is the atomic number of an element?

• Number of protons

• Number of neutrons

• Number of electrons

• Number of atoms

What is the mass number of an atom?

• Number of protons and neutrons

• Number of electrons

• Number of protons

• Number of neutrons

Which element has the atomic number 1?

• Hydrogen

• Helium

• Lithium

• Beryllium

What is the charge of a neutron?

• Neutral

• Positive

• Negative

• Variable

What is the smallest part of a chemical element that retains its chemical properties?

• Atom

• Molecule

• Ion

• Compound