Understanding Atoms

Atoms are incredibly small and consist of protons, neutrons, and electrons, with a lot of empty space. The nucleus, made of protons and neutrons, is tiny compared to the atom's size, similar to a grain of sand in an Olympic pool. Electrons, even smaller, move around the nucleus. Protons and neutrons have a mass of one, while electrons are much lighter. The atom's mass is concentrated in the nucleus. Protons are positive, neutrons are neutral, and electrons are negative, making the atom's overall charge neutral.

What are the three main components of an atom?

• Protons, neutrons, and photons

• Protons, electrons, and quarks

• Protons, neutrons, and electrons

• Electrons, neutrons, and quarks

Tags

NGSS.MS-PS1-1

What is the nucleus of an atom primarily composed of?

• Protons and quarks

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

How does the size of the nucleus compare to the size of the atom?

• The nucleus is much larger than the atom

• The nucleus is about the same size as the atom

• The nucleus is much smaller than the atom

• The nucleus is twice the size of the atom

Where are electrons found in an atom?

• In the center of the atom

• Fixed in place around the nucleus

• Randomly moving around the nucleus

• Inside the nucleus

How does the mass of an electron compare to that of a proton?

• An electron is twice as heavy as a proton

• An electron is heavier than a proton

• An electron has the same mass as a proton

• An electron is much lighter than a proton

What is the relative mass of a proton?

• 1840

• 1

• 0.5

• 0.0005

Which particle has a mass of approximately 1/1840 of a proton?

• Neutron

• Electron

• Photon

• Quark

What charge does a proton carry?

• Negative

• Positive

• Neutral

• No charge

What is the charge of an electron?

• Positive

• Negative

• No charge

• Neutral

Tags

NGSS.MS-PS2-3

Why is the overall charge of an atom neutral?

• Because neutrons balance the charge

• Because it has an equal number of protons and electrons

• Because it has more electrons than protons

• Because it has more protons than electrons