15 questions
What are valence electrons?
The total number of electrons in an atom
The number of electrons in the outermost shell
The number of electrons in the second shell
The number of protons in the outermost shell
Which elements have the most similar chemical properties?
boron and carbon
oxygen and sulfur
aluminum and bromine
argon and silicon
All atoms are most stable with (or would "prefer") how many electrons in their valence shell?
1
2
8
18
When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?
The total number of neutrons in the unknown element
The total number of particles in the nucleus of the unknown element
The number of protons in the nucleus of the unknown element
The number of valence electrons in the unknown element
What groups are the most reactive metals?
2 and 3
1 and 18
1 and 2
16 and 17
What groups are the most reactive non metals?
1 and 2
16 and 17
2 and 17
1 and 16
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.