Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.
It showed that the richest Harappan citizens had excess food to trade or sell. It showed that Harappa could store excess food to save, sell, or trade with others.
The kind of energy released when atoms are rearranged to form new bonds is called Chemical energy.
Answer:
Chemical change :has change in mass, heat is needed, new element is formed, hard to reverse.......
Physicalchange:does not have change in mass, heat is not necessary, no new element is formed, easy to reverse
The statement of letter B, the collisions of particles with one another is completey elastic, is true about Kinetic Molecular Theory. Elastic collisions means that there is no energy transfer between the particles.
