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WorksheetsBasics of an atom
Total questions: 20
Worksheet time: 7mins
What is the charge of an electron?
+1
-1
0
What is the mass number of Potassium?
19
20
39
58
How many neutrons does an atom of Potassium have?
19
20
39
58
How many electrons does an atom of Oxygen have?
8
10
16
18
Valency of Boron is
1
3
2
How many valence electrons are there in Nitrogen?
7
5
6
How many valence electrons does sodium have?
1
2
3
4
How many valence electrons does Phosphorus have?
31
5
15
4
How many valence electrons should Magnesium have in its Lewis dot model?
1
2
3
4
This is a correct dot diagram for nitrogen (N)
true
false
Which ones are acceptable?
What electron configuration matches an oxygen atom?
1s22s22p63s2, 3p64s23d104p5
1s22s22p4
1s22s22p6
1s22s22p63s23p64s23d1
What atom matches this electron configuration?
1s22s22p63s23p64s23d10
Zinc
Copper
Nickel
Germanium
How many valence electrons does Phosphorus have?
31
5
15
4
Which elements have the most similar chemical properties?
boron and carbon
oxygen and sulfur
aluminum and bromine
argon and silicon
Why are halogens so reactive?
They want to get rid of their only valance electron
They only need one more electron
They are non reactive, they have a full shell
How do electrons of an element determine that element's reactivity?
If the valence shell has missing electrons it is very reactive to attract or lose more electrons.
If the valence shell has a full ring of electrons it is very reactive because it needs more.
If the valence shell has a full shell of electrons it is very reactive because it is already full.
If the valence shell has missing electrons it is not reactive because it is missing electrons.
