Q.1
True or False: The symbol in LEDS represents the valence electrons and the dot represents the nucleus
  • true
  • false
Q.2
True or False: Atoms that have a valence electrons of less than eight are not stable.
  • true
  • false
Q.3
The elements in this group all have 3 valance electrons.
  • Group 13
  • Group 15
  • Group 3
  • Group 18
Q.4
What group of elements is the most stable? Being stable means it would not react.
  • Group 18
  • Group 17
  • Group 1
  • Group 2
Q.5
The atomic mass of Titanium isand its proton istherefore its number of neutron is ________
  • 22
  • 24
  • 26
  • 70
Q.6
Valence electrons plays a key role in chemical reactions and it increases from left to right of the periodic table.
  • TRUE
  • FALSE
Q.7
This element has 2 valance electrons and 3 electron shells.
  • Beryllium
  • Strontium
  • Magnesium
  • Calcium
Q.8
What element has 4 valance electrons and three electron energy levels (also called energy shells)?
  • Silicon
  • Carbon
  • Germanium
  • Arsenic
Q.9
This metalloid has 3 electron shells.
  • Boron
  • Silicon
  • Tellerium
  • Tin
Q.10
Which group has the greatest number of valence electrons?
  • 1
  • 14
  • 18
  • 16
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