Atoms DCA Review

Atoms DCA Review

Test is December 13 or 15

Here are two atom model pictures of Lithium. Which one is the correct model and which one is the incorrect model?

Use your spiral if you are confused.

This image is INCORRECT. Electrons are not located in the nucleus (grey dots with the red negative sign)

This is the correct model because protons and the neutrons are located in the nucleus (the middle). The electrons are located in the shells.

Multiple Select

What are the characteristics of a proton?

• Positive charge

• Live in shells

• Live in the nucleus

• Have a mass of 1 amu

• Negative charge

Multiple Select

What are the characteristics of an electron?

• Negative charge

• Neutral charge

• Live in rings

• Are the smallest part of an atom

How do you know how many protons, neutrons and electrons an element has?

Gallium has 31 protons and 31 electrons.

Gallium has 39 neutrons. First round 69.72 to the nearest whole number. Then subtract 70-31 to find how many neutrons it has.

Multiple Choice

How many protons does Argon have?

• 18

• 39.948

• 40

• 8

Multiple Choice

What are the 3 subatomic particles of an atom?

• carbon atom, proton, electron

• quarks, neutrons, protons

• nucleus, protons, electrons

• protons, neutrons, electrons

Multiple Choice

What is the atomic mass of Fluorine?

• 9

• 18

• 17

• 19

Multiple Choice

How many neutrons does Argon have?

• 18

• 39.948

• 22

• 8

Multiple Choice

How many electrons does Argon have?

• 18

• 39.948

• 22

• 8

Multiple Choice

What element has 25 protons?

• Manganese

• Iron

• Carbon

• Potassium