Q.1.
True or False: The symbol in LEDS represents the valence electrons and the dot represents the nucleus
Q.2.
True or False: Atoms that have a valence electrons of less than eight are not stable.
Q.3.
The elements in this group all have 3 valance electrons.
Q.4.
What group of elements is the most stable? Being stable means it would not react.
Q.5.
The atomic mass of Titanium isand its proton istherefore its number of neutron is ________
Q.6.
Valence electrons plays a key role in chemical reactions and it increases from left to right of the periodic table.
Q.7.
This element has 2 valance electrons and 3 electron shells.
Q.8.
What element has 4 valance electrons and three electron energy levels (also called energy shells)?
Q.9.
This metalloid has 3 electron shells.
Q.10.
Which group has the greatest number of valence electrons?