Question

solve the following questions​

Answer 1

Answer:

2)Isotopes are atoms with the same number of protons but that have a different number of neutrons. Since the atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, we can also say that isotopes are elements with the same atomic number but different mass numbers.

Example :- A  very popular element, carbon, also has isotopes. There are      three isotopes of carbon: carbon-12, carbon-13 and carbon-14. The    numbers that are after the carbon refer to the atomic mass.

3) Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.

4) In calcium phosphate Ca₃(PO₄)          

                   Element Symbol Mass Percent

                   Calcium     Ca      38.763%

                  Phosphorus    P             19.972%

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