Atoms, Ions, and Isotopes Review

Name of the positively charged particle in an atom

• Proton

• Electron

• Neutron

• Neuclus

Answer explanation

The positively charged particle in an atom is the proton. Protons are found in the nucleus and have a positive charge, while electrons are negatively charged and neutrons are neutral.

Name of the neutral particle in an atom

• Proton

• Electron

• Neutron

• Neuclus

Answer explanation

The neutral particle in an atom is the neutron. Protons are positively charged, and electrons are negatively charged, while neutrons have no charge, making them neutral.

Tags

NGSS.MS-PS1-1

A negative ion is called an

• Ion

• Cation

• Anion

Answer explanation

A negative ion is called an anion. This is because anions are formed when an atom gains one or more electrons, resulting in a net negative charge, distinguishing them from cations, which are positive ions.

Tags

NGSS.MS-PS2-3

Electrons move around the ______.

• Proton

• Neutron

• Electron Cloud

• Nucleus

Answer explanation

Electrons move around the nucleus, which contains protons and neutrons. The nucleus is the central part of an atom, and the electron cloud represents the area where electrons are likely to be found around the nucleus.

If Chlorine (Cl) gains an electron what is its charge?

• -2

• -1

• +2

• +1

Answer explanation

When Chlorine (Cl) gains an electron, it becomes negatively charged. Since it gains one electron, its charge is -1. Therefore, the correct answer is -1.

The number of protons and electrons in an atom are _____, but in an Ion they are ______

• Equal, the same

• The same, Unequal

• Equal, Unequal

• Unequal, Equal

Answer explanation

In a neutral atom, the number of protons equals the number of electrons, resulting in no charge. However, in an ion, the number of protons and electrons is unequal, leading to a positive or negative charge.

How many electrons does the element above have?

• 13

• 10

• 16

Answer explanation

The element with atomic number 10 is neon, which has 10 electrons. Each electron corresponds to one proton in a neutral atom, confirming that the correct answer is 10.

Tags

NGSS.MS-PS1-1

The difference between an ATOM and an ISOTOPE is?

• Different number of protons

• Different number of neutrons

• Different number of electrons

Answer explanation

Atoms of the same element can have different numbers of neutrons, leading to different isotopes. The number of protons defines the element, while isotopes vary in neutron count, not in protons or electrons.

Since atoms are so small, their mass is measured using a special unit called an atomic mass unit (amu), where 1 amu is equal to the mass of a ______ and an ________. .

• Neutron, Nueclus

• Electron, Neutron

• Proton, Electron

• Proton, Neutron

Answer explanation

1 amu is defined as the mass of a proton and a neutron, which are the primary components of an atom's nucleus. Electrons have much less mass and do not contribute significantly to the atomic mass.

What is the difference between and Ion and an Isotope?

• Ions change the number of electrons. Isotopes change the number of neutrons.

• Ions change the number of protons Isotopes change the number of neutrons.

• Ions change the number of electrons. Isotopes change the number of protons.

• Isotopes change the number of electrons. Ions change the number of neutrons.

Answer explanation

Ions are formed when atoms gain or lose electrons, resulting in a charge. Isotopes are variants of the same element that differ in the number of neutrons, affecting their mass but not their charge.