The Atom: Structure and Subatomic Particles

Which subatomic particle has a positive charge and is found in the nucleus of an atom?

• Proton in the nucleus core

• Neutron in the outer shell

• Electron in the electron cloud

• Ion in the energy levels

What is the atomic number of an element equal to?

• Number of protons in nucleus

• Sum of neutrons and electrons

• Total of protons and neutrons

• Maximum electrons in outer shell

Which statement best describes electrons in an atom?

• Negatively charged, move in energy levels

• Positively charged, bound in nucleus

• Neutral particles, no movement

• Massive particles in the core

What is the mass number of an atom?

• Sum of protons and neutrons

• Count of electrons only

• Number of protons only

• Total energy levels present

In a neutral atom, how does the number of electrons compare to protons?

• Equal numbers in neutrality

• Electrons always fewer

• Protons always greater

• Electrons double protons

An atom has 11 protons and 12 neutrons. What is its mass number?

• Twenty-three in total

• Eleven in total

• Twelve in total

• Thirty-three in total

Nitrogen has 7 protons and 7 neutrons with two energy levels filled. What is nitrogen’s atomic number and mass number?

• Atomic 7, mass 14

• Atomic 14, mass 7

• Atomic 7, mass 7

• Atomic 14, mass 14

Tags

NGSS.MS-PS1-1

What does a period represent on the periodic table?

• A vertical column of elements

• Elements with similar reactivity

• A horizontal row of elements

• A block of transition metals

As you move across a period from left to right, what generally increases by one each step?

• Number of energy levels

• Atomic number count

• Metallic character level

• Ionic charge magnitude

What does a group (family) represent on the periodic table?

• Horizontal rows of elements

• Elements with identical masses

• Vertical columns of elements

• Separate lanthanide series