Some questions

1. THE ATOM
Some questions for you to attempt

2. TRY THIS!
• Using the simulation above, answer the following:
• How many protons are present in the nucleus of a:
• Hydrogen atom?
• Neon atom?
• Carbon atom?
• How many electrons are needed on the OUTERMOST electron shell of an oxygen atom
for it to have an overall neutral charge?
• What about a hydrogen atom?

3. CHECK YOUR ANSWERS
• How many protons are present in the nucleus of a:
• Hydrogen atom? 1
• Neon atom? 10
• Carbon atom? 6
• How many electrons in the OUTERMOST electron shell of a single oxygen atom? 6
• What about a neon atom? 8

4. Atomic
number
Mass
number
Number of
protons
Number of
neutrons
Number of
electrons
Symbol of
the atom
6 6 6
32 16
11 12
8 8
9 19
127 74
COMPLETE THE TABLE
• Using your textbook or the internet, complete the following table:

5. Atomic
number
Mass
number
Number of
protons
Number of
neutrons
Number of
electrons
Symbol of
the atom
6 12 6 6 6
16 32 16 16 16
11 23 11 12 11
8 16 8 8 8
9 19 9 10 9
53 127 53 74 53
CHECK YOUR ANSWERS

6. Number of
protons
Number of
neutrons
Number of
electrons
overall
charge
Is it an atom
or an ion
symbol
8 6 8
10 10 10
11 10 10
17 16 18
15 15 18
19 18 1 K⁺
20 19 2
7 10 -2
COMPLETE THE TABLE
• Using your textbook or the internet, complete the following table:

7. Number of
protons
Number of
neutrons
Number of
electrons
overall
charge
Is it an atom
or an ion
symbol
8 6 8 0 atom O
10 10 10 0 atom Ne
11 10 10 1 ion Na
+
17 16 18 -1 ion Cl-
15 15 18 -3 ion P3-
19 18 18 1 ion K⁺
20 19 18 2 ion Ca2+
8 7 10 -2 ion O
2-
CHECK YOUR ANSWERS