U2L2 DE PS

Which subatomic particle has the greatest mass?

• Protons and neutrons have equal mass

• Proton

• Neutron

• Electron

Answer explanation

Protons and neutrons have nearly equal mass, both being significantly more massive than electrons. Therefore, the correct answer is that protons and neutrons have equal mass.

Which subatomic particle has the smallest mass?

• Proton

• Neutron

• Electron

• All have equal mass

Answer explanation

The electron has the smallest mass among subatomic particles, significantly lighter than protons and neutrons. Protons and neutrons have similar masses, but both are much heavier than electrons.

Which particle is approximately 1836 times less massive than a proton?

• Neutron

• Electron

• Alpha particle

• Proton and electron have equal mass

Answer explanation

The electron is approximately 1/1836 the mass of a proton, making it significantly lighter. In contrast, neutrons and alpha particles are much more massive than electrons, and protons and electrons do not have equal mass.

The relative mass of a neutron compared to a proton is:

• Much smaller

• Much larger

• Approximately equal

• Exactly zero

Answer explanation

The mass of a neutron is approximately equal to that of a proton, with both being about 1 atomic mass unit. This makes the correct answer 'Approximately equal'.

Which statement about particle masses is correct?

• Electrons are the most massive subatomic particles

• The nucleus accounts for nearly all of an atom's mass

• Neutrons are significantly more massive than protons

• All subatomic particles have identical masses

Answer explanation

The nucleus, composed of protons and neutrons, contains most of an atom's mass, while electrons contribute negligibly. Thus, the statement 'The nucleus accounts for nearly all of an atom's mass' is correct.

The charge on a proton is ____, the charge on an electron is ____, and the charge on a neutron is ____

• +1, -1, 0

• -1, +1, 0

• 0, +1, -1

• +1, 0, -1

Answer explanation

The charge on a proton is +1, indicating a positive charge. The charge on an electron is -1, indicating a negative charge. A neutron has no charge, represented as 0. Therefore, the correct answer is +1, -1, 0.

Which pairing of subatomic particle with charge is correct?

• proton/1-

• neutron/1+

• electron/1-

• electron/1+

Answer explanation

The correct pairing is electron/1-. Electrons carry a negative charge of -1, while protons have a positive charge of +1, and neutrons are neutral with no charge. Thus, the only accurate option is the electron with a -1 charge.

Tags

NGSS.HS-PS2-4

Which particles have opposite charges?

• Protons and neutrons

• Electrons and neutrons

• Protons and electrons

• All particles have the same charge

Answer explanation

Protons have a positive charge, while electrons have a negative charge, making them opposites. Neutrons are neutral and do not have a charge, so they do not fit this criterion.

Tags

NGSS.MS-PS2-3

The electronic charge (1.602 × 10^-19 C) represents:

• The charge of a neutron

• The magnitude of an electron's charge

• The charge of a nucleus

• The total charge of an atom

Answer explanation

The electronic charge of 1.602 × 10^-19 C is the magnitude of an electron's charge, which is negative. It does not represent a neutron, nucleus, or total charge of an atom.

Tags

NGSS.HS-PS2-5

Which particle is electrically neutral?

• Proton

• Electron

• Neutron

• All are neutral

Answer explanation

The neutron is the particle that is electrically neutral, meaning it has no charge. In contrast, protons are positively charged and electrons are negatively charged.

Tags

NGSS.MS-PS2-3