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WorksheetsBohr & Electrons
Total questions: 10
Worksheet time: 10mins
Name
Class
Date
1.
Why did Bohr choose to work with hydrogen?
a)
The nucleus of hydrogen is small.
b)
Hydrogen has only 1 electron.
c)
The element chooses the scientist; it is not often clear why.
d)
Hydrogen is affordable.
2.
Bohr found that when atoms absorb precise amounts of energy (quanta), the electron(s) will
a)
move to another atom.
b)
fall into the nucleus.
c)
move to higher energy levels.
d)
go to ground state.
3.
How many electrons can reside in the third energy level?
a)
8
b)
18
c)
10
d)
6
4.
Electrons will spread out among each orbital before pairing.
a)
True
b)
False
5.
What is the electron configuration for cobalt?
a)
1s22s22p63s23p64s23d7
b)
1s22s22p63s23p64s24d7
c)
1s22s22p63s23p63d103p64s24d7
d)
1s22s22p83s23p83d9
6.
Why are noble gases stable elements?
a)
Their energy levels are filled.
b)
Their nucleus is not charged.
c)
They do not use d sub-levels.
d)
They always have balloons.
7.
When an electron moves toward the nucleus, energy is
a)
absorbed.
b)
emitted.
c)
repelled.
d)
refracted.
8.
An emission spectrum is produced when
a)
electrons move to lower levels.
b)
atoms absorb energy.
c)
electrons move to higher levels.
d)
atoms have too much energy.
9.
When the electron in a hydrogen atom returns to ground state, energy is emitted in the ________ region.
a)
visible
b)
infrared
c)
ultraviolet
d)
red
10.
In an electron configuration, the 3d sub-level fills before the 4s sub-level.
a)
True
b)
False
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