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11. Metals having body centered cubic (bcc) or hexagonal closed pack structure like steel(iron), chromium, molybdenum, tungsten, zinc etc, have the property of brittle fracture at low temperature of cold shortness.
4. a) Atom is the smallest constituent unit of a substance which retains the characteristics of the element.
b) Element-A chemical element is that particular kind of atoms which have the same number of protons in their nucleii (or in other words have the same atomic number).
c) Neutrons and protons:
Proton is a subatomic particle having one unit positive elementary charge(+1e) and mass of approximately one atomic mass unit. It is slightly lighter than neutron.
Neutron is also a subatomic particle with no electric charge. The mass is approximately one atomic unit. It is slightly heavier than proton.
d) Smallest part of a substance that exist independently is called a molecule.
e) Forms of Energy
1. Kinetic
2. Potential( gravitational, electric or magnetic)
3. Elastic
4. Chemcal
5. Radiation
6. Thermal
7. Due to mass energy equivalence, mass can also be called a form of energy.
(Please note that only the first complete question needs to be answered as per Chegg guidelines)
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