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AP Biology Basic Chemistry

Total questions: 15

Worksheet time: 30mins

Name
Class
Date
1.
The image shows the periodic grid for POTASSIUM. How many ELECTRONS are found in a potassium atom?
a)
19
b)
39
c)
20
d)
Impossible to tell
2.
The image shows the periodic grid for POTASSIUM. What is Potassium's atomic mass?
a)
19
b)
39
c)
20
d)
Impossible to tell
3.
The image shows the periodic grid for POTASSIUM. How many PROTONS are found in a potassium atom?
a)
19
b)
39
c)
20
d)
Impossible to tell
4.
What does the ATOMIC MASS tell us about an atom?
a)
Protons + Neutrons
b)
Protons + Electrons
c)
Neutrons + Electrons
5.

What type of chemical bond is formed between two atoms when electrons are shared?

a)

ionic

b)

covalent

c)

hydrogen

d)

spontaneous

6.

Which of the follow is NOT one of the 6 most common elements found in living things?

a)

C

b)

N

c)

Fe

d)

O

e)

P

7.

What type of bond is formed between an atom that has lost an electron and an atom that has gained an electron?

a)

covalent

b)

hydrogen

c)

van der Waal

d)

ionic

8.

What is the number of valence electrons (the electrons on the outer-most shell) for Oxygen?

a)

8

b)

6

c)

2

d)

1

9.
Which notations represent different isotopes of the element sodium?
a)
32S and 34S
b)
S2- and S6+
c)
Na+ and Na0
d)
22Na and 23Na
10.

A positively or negatively charged atom.

a)

covalent bond

b)

compound

c)

ion

d)

chemical bond

11.

If an atom has 12 protons, which of the following must it also have to be considered a neutral atom?

a)

12 neutrons

b)

12 electrons

c)

12 protons

d)

24 protons and neutrons

12.

What charge does an atom have when it GAINS electrons?

a)

Positive

b)

Negative

c)

Neutral

13.

When an atom loses an electron, it becomes a(n) _____________ ion.

a)

positive

b)

negative

c)

neutral

d)

polyatomic

14.
How many total electrons does O-2 (an oxide ion) have?
a)
8
b)
10
c)
6
d)
18
15.
How many total electrons does Na+1 (a sodium ion) have?
a)
10
b)
11
c)
12
d)
22

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