The Atom Part 2

The Atom Part 2

by Kristal Campbell

​RECAP QUESTIONS

Multiple Choice

What are the 3 subatomic particles of an atom?

• carbon atom, proton, electron

• nucleus, protons, electrons

• protons, neutrons, electrons

Multiple Select

Which particles contribute the most to the mass of an atom? Choose all that apply.

• protons

• electrons

• neutrons

Multiple Select

Which particle(s) are found in the nucleus of an atom? Choose all that are correct.

• Protons

• Neutrons

• Electrons

Multiple Choice

Which particle has a neutral or no charge?

• proton

• neutron

• electron

• nucleus

Multiple Choice

Which particle has a negative charge?

• electrons

• protons

• neutrons

Multiple Choice

What particle(s) would be found orbiting the nucleus?

• neutrons

• electrons

• protons

Representation of the elements​

• Elements are symbolized by 1 or 2 letters

• Example C, O, F, Mg, Na

​Symbols of elements

Multiple Choice

What is the symbol of this atom?

• 3

• 7

• Lithium

• Li

• • Protons and Neutrons contribute to the mass of the atom

  • Electrons DO NOT contribute to the mass of the atom BECAUSE they are TOO SMALL

  • PROTONS + NEUTRONS = Mass Number

Mass Number (A)

Fill in the Blank

___________ and ___________ contribute to the Atomic Mass/ Mass Number.

Multiple Choice

What is the mass number of this atom?

• 1

• 4

• 3

• 7

Fill in the Blank

A phosphorus atom has 15 protons and 16 neutrons. What is the mass number?

​Atomic Number (Z)

• This is the number of protons in the nucleus of an atom​

Multiple Choice

What is the atomic number of this atom?

• 1

• 4

• 3

• 7

Fill in the Blank

Oxygen has 8 protons. What is oxygen's atomic number?

Fill in the Blank

If an element has a mass number of 24 and an atomic number of 12, what is the number of protons in this element

​Neutral Atoms

​

​

Neutral atoms have to have the SAME number of protons and electrons because the (+) and (-) charges will cancel out.

​

​Therefore the number of electrons is equal to the atomic number (number of protons)

Multiple Choice

The atomic number of an elements is the same as the number of ----

• protons or electron

• protons or neutrons

• electrons or nucleus

Fill in the Blank

What is the number of electrons in chlorine atom ?

Multiple Choice

How many electrons are in an atom with an atomic number of 50?

• 10

• 45

• 50

• 5

Calculating the Number of Neutrons​

​Number of Neutrons

• ​To find the number of neutrons in an atom subtract the atomic number from the mass number

• ​Number of neutrons = Mass number (A) - Atomic number (Z)

Fill in the Blank

If an element has a mass number of 24 and an atomic number of 12, what is the number of neutons in this element

Multiple Choice

How many Neutrons are present in the Sodium atom ?

• 23

• 11

• 34

• 12

Fill in the Blank

An element has the mass number 12 and atomic number 6. The number of neutrons in it is:

​THE END

​Ill SEE YOU NEXT YEAR ❤

​