Structure of atoms

Like charges

• attract

• repel

• destroy one another

Tags

NGSS.MS-PS2-3

Opposite charges

• attract

• repel

• destroy one another

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which particles change the charge in atoms when ions are formed?

• Protons

• Electrons

• Neutrons

• Kittens

The atomic number of an atom is determined by the number of

• protons

• electrons

• neutrons

• isotopes

The _______ of an atom is the number of neutrons plus protons.

• atomic number

• nucleus number

• mass number

• half-life

_______ are atoms of the same element that have different numbers of neutrons.

• Compounds

• Isotopes

• Mixtures

Which of the following best describes an atom?

• protons and electrons grouped together in a random pattern

• protons and electrons grouped together in a random pattern

• a core of protons and neutrons surrounded by electrons

• a core of protons and neutrons surrounded by electrons

Tags

NGSS.MS-PS1-1

What is the mass number in atomic mass units (amu) of an atom with 14 protons, 14 electrons, and 16 neutrons?

• 14 amu

• 16 amu

• 30 amu

• 44 amu

Tags

NGSS.MS-PS1-1

Which statement best describes the density of an atom's nucleus?

• The nucleus occupies most of the atom's volume but contains little of its mass.

• The nucleus occupies most of the atom's volume but contains little of its mass.

• The nucleus occupies most of the atom's volume and contains most of its mass.

• The nucleus occupies very little of the atom's volume but contains most of its mass.

An atom becomes _________ when it gains electrons.

• Positive (+)

• Negative (-)

• Neutral (0)

• Invisible