chemical combination

the number of known elements up till now is..........elements

• 92

• 118

• 121

• 211

Elements can be classified according to their properties and electronic structure into

• Metals and non-metal

• Metals only

• Non-metals only

• Metals,non-metals and noble gases

Elements contain less than 4 electrons in outermost energy level

• Non-metals

• Metals

• Inert gases

• No correct answer

Elements contain more than 4 electrons in outermost energy level

• Metals

• Non-metals

• Nobel gases

• No correct answer

..............is the only liquid metal element

• Bromine

• Mercury

• Iron

• Water

..................is the only liquid non-metal element

• Bromine

• Mercury

• Iron

• water

..........tend to lose electrons and change to positive ion during chemical reaction

• Metals

• Non-metals

• Inert gases

• No correct answer

..........tend to gain or share electrons and change to negative ion during chemical reaction

• Metals

• Non-metals

• Inert gases

• No correct answer

......... is the atom of an elements loses or gains electrons during chemical reaction

• Element

• Atom

• Ion

• Iinert gas

............... don't participate in chemical reaction due to completeness of outer most energy level with electrons

• Metals

• Non-metals

• Inert gases

• No correct answer