Atomic Structure Atomic Models and Isotopes

A proton has a...charge.

(a)  

An electron has a...charge.

(a)  

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.

(a)  

Tags

NGSS.HS-PS1-7

Thanks to the gold foil experiment, we know most of the atom is (a)   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?

(a)  

Tags

NGSS.MS-PS1-1

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

(a)  

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!

(a)