Question

Answer the question from the attachment.YOU will 100 points.

7f4c89fc84014a34b8aced415eb7d65d.docx

Answer 1

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Answer 2

Answer:

1. Neutron

Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.

2. The total number of electrons in an atom is always the same as the number of protons in the nucleus. This means atoms have no overall electrical charge.

3.No. of electrons = atomic no. = 12. Thus, electronic configuration of X becomes 2, 8, 2.

4.Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.

5. If an atom contains 3 protons and 4 neutrons then atom will be of Lithium element. The outermost orbit of Lithium has 1 Electron so it's valency could be +1 or -1.

6. we can say that isobars are those elements which have a different atomic number but the same mass number. ... The example of two Isotopes and Isobars is iron and nickel. Both have the same mass number which is 58 whereas the atomic number of iron is 26, and the atomic number of nickel is 28.

7.An element X is a metal because one electron is present in the outermost shell i.e., 1 valence electron. When this valence electron is removed from the outermost shell, a cation (positive ion) will be formed with a charge of + 1.

8.Radioactive isotopes have many useful applications. In medicine, for example, cobalt-60 is extensively employed as a radiation source to arrest the development of cancer. Other radioactive isotopes are used as tracers for diagnostic purposes as well as in research on metabolic processes.

9.Chloride ion (Cl−) has −1 charge. To maintain electrical neutrality, one metal ion will combine with two chloride ions. A chloride of the same metal will have the formula MCl2.

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