Atoms and the Periodic Table (8.5A - 8.5B - 8.5C)

Looking at the Bohr model for Argon (Ar). How many energy levels does it have and number of valence electrons?

This Bohr model of Argon (Ar) shows that Argon has ​a ​

​ ​ (a)   energy levels and ​ (b)   valence electrons.

• 8
• 3
• 4
• 18

Tags

8.5a

Which 2 characteristics describe neutrons?

• neutral charge

• located in the nucleus

• negative charge

• positive charge

• located in the electron cloud

Tags

8.5A

Which 2 characteristics describe protons?

• neutral charge

• located in the nucleus

• negative charge

• positive charge

• located in the electron cloud

Tags

8.5A

Which 2 characteristics describe electrons?

• neutral charge

• located in the nucleus

• negative charge

• positive charge

• located in the electron cloud

Tags

8.5A

 What is the mass number of this element?

• 5
• 27
• 32
• 59

Answer explanation

The mass number of an atom is the mass of the nucleus:

Protons + Neutrons = Mass

In this example:

Protons (27) + Neutrons (32) = Mass (59)

Tags

8.5a

An atom of a certain element has 11 electrons, and a mass number of 23. This element is very reactive in room temperature. How many neutrons are in this atom?

• 11

• 12

• 33

• 23

Answer explanation

An atom of a certain element has 11 electrons, and a mass number of 23. This element is very reactive in room temperature. How many neutrons are in this atom?

If you use your APE MAN formula:

A (Atomic Number) = 11

P (Protons) = 11

E (Electrons) = 11

M (Mass Number) = 23

• -- A (Atomic Number) = 11

  • N (Neutrons) = 12

Tags

NGSS.MS-PS1-1

Use the element tile for Sulfur (S) to match the elements with their correct label.

• Sulfur

• Element Name

• 32

• Element Symbol

• S

• Mass Number

• 16

• Atomic Number

Tags

8.5a

Protons, Neutrons & Electrons are examples of

• subatomic particles

• valence electrons

• elements

Answer explanation

Subatomic:

Sub = lower (smaller)

Subatomic

-ic = having to do with

Sub + atom + ic

Parts of an atom, smaller than an atom

subatómico

Tags

8.5a

The smallest particle of an element; made of electrons, protons, and neutrons

• valence electron

• electron cloud

• atomic mass

• atom

Tags

8.5a

Use the periodic table to match the element with its description.

• 1 valence electron and mass number 1

• Tin (Sn)

• alkali earth metal with 56 protons

• Argon (Ar)

• group 14 and period 5

• Barium (Ba)

• 8 valence electrons and 3 energy levels

• Bromine (Br)

• halogen with 4 energy levels

• Hydrogen (H)

Tags

8.5c