Atomic Structure Atomic Models and Isotopes

A proton has a...charge.

An electron has a...charge.

Which of the following atomic particles is in the nucleus? Select all that apply.

• Protons

• Neutrons

• Electrons

• Electron Cloud

Protons and neutrons have...while electrons have almost none. This is why the nucleus is so dense.

Tags

NGSS.HS-PS1-7

Thanks to the gold foil experiment, we know most of the atom is _____ space, outside of the dense and small nucleus.

Which element has an atomic number of 3? You may look at your periodic table for this.

• Hydrogen

• Helium

• Lithium

• Carbon

If an element has an atomic number of 3, how many protons does it have?

Tags

NGSS.MS-PS1-1

If an atom is NEUTRAL (has no charge) and has 3 protons, how many electrons does it have?

If an element has an atomic number of 3 and an atomic mass of 7, how many NEUTRONS does it have? (Hint: what makes up the mass of an atom?)

• 4

• 5

• 6

• 7

Tags

NGSS.MS-PS1-1

If an element has an atomic number of 5 and you add one proton, what element is it now? Hint: Adding a proton changes the atomic number!