![]() ![]() An atom of element E contains 3 protons, 3 electrons and 4 neutrons :(a) What is its atomic number?(b) What is its mass number?(c) Write the electronic configuration of the element E.(d) State whether element E is a metal or non-metal.(a) What is the nucleus of an atom and what is the nature of charge on it?(b) Name the scientist who discovered the nucleus of atom. ![]() This particle must be :(a) a molecule (b) a binary compound (c) an anion (d) a cation A particle P has 18 electrons, 20 neutrons and 19 protons.What is the reason for positive charge on a sodium ion and a negative charge on a chloride ion ? Explain the formation of (i) sodium ion, and (ii) chloride ion, from their respective atoms giving the number of protons and number of electrons in each one of them.This particle is most likely to be :(a) a cation (b) an anion(c) a molecule (d) a compound A particle X has 17 protons, 18 neutrons and 18 electrons.Give one difference between cation and anion.(a) What is the difference between a cation and an anion ? Explain with examples.(b) The valencies (or charges) of some of the ions are given below : Ion Valency (Charge) Ion Valency (Charge)Sodium ion 1+ Nitrate ion 1–Copper ion 2+ Sulphide ion 2–Using this information, write down the formulae of :(i) Sodium sulphide(ii) Copper nitrate.What is the difference between a cation and an anion? How are they formed? Give the names and symbols of one cation and one anion.
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