Question

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Answer 1

Answer:

(a) Isotopes are elements with same atomic number and different atomic mass number. They have the same number of electrons and thus the same electronic configuration. As the chemical properties of an element depend on their electronic configuration , these elements are chemically similar

Answer 2

Answer:

a) Isotopes of an element have the same number of electrons. They have the same electronic distribution in various orbitals around the nucleus. They differ in the number of neutrons in the nucleus. ... Since Isotopes have same number electrons in the same orbitals, their chemical properties remain same.

b) Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged). If an atom gains or loses one or more electrons, it becomes an ion.

c) The noble gases show less reactivity because they already have a filled valence shell of electrons. A noble gas has no need to gain or lose electrons to gain a stable electron configuration. That doesn't mean that noble gases are completely inert.

d) Yes, the nucleus of an atom is heavy and positively charged because the atom contains 2 subatomic particles they are the protons and neutrons. the protons are positively charged and the neutrons don't have any kind of charge that is they are neutrally charged.

Explanation:

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