JJ Thomson discovered the electron :)
Answer:
Explanation:
Answer: The Jallianwala Bagh massacre, also known as the Amritsar massacre, took place on 13 April 1919 when troops of the British Indian Army under the command of Acting Brigadier-General Reginald Dyer fired rifles into a crowd of unarmed Indian civilians who had gathered in Jallianwala Bagh, Amritsar, Punjab. The civilians had assembled for a peaceful protest to condemn the arrest and deportation of two national leaders, Satya Pal and Saifuddin Kitchlew, and to honour the Sikh festival of Baisakhi.
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Answer: 
: Pure substance, Element
: Pure substance , Element
: Pure substance, Compound
Explanation:
Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: 
and
Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example:
Heterogeneous Mixture : Mixture that has its different components mixed unevenly within the substance
. Example: Air
Homogeneous Mixture : Mixture that has its different components mixed evenly within the substance. Example: sugar dissolved in water
The heated soup moves to the tip by convection
A normal carbon atom has 6 electrons
