Answer:
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The temperature is different because of the molecular make up of sand and water. Sand's atoms are much closer together because it is a solid so they bump into each other causing the substance, in this case sand, to heat up and stay heated longer. Water's atoms are much more spread out than that of sand so it takes longer for it to warm up because the atoms are not bumping into each other as much.
- Atomic weight of copper = 63.5 g
- 1 mole of copper contains = 63.5g = 6.023 × 10²³ atoms of copper
- 1 g of copper contains
- = 9.4 × 10²¹ atoms
- Therefore, 3.11g of copper contains
- = 29.234 × 10²¹ atoms
Hope you could get an idea from here.
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Bohr atomic model different from the plum-pudding model as the Plum pudding model did not encounter the concept of nucleus it simply says compares atom with a pudding in which electrons are spread around as rasins in a pudding while bohr explain atom that is having nucleus that serves as a centre of the atom , and there are electrons around nucleus that occupy certain energy levels.