PLEASE GIVE THE ANSWER FOR QUESTION 9 FAST
Answers
Answer:
Q8. (i) K₂O
(ii) Al(NO3)3
(iii) NaOH
Q9. (i) P=8,Q=13
(ii) 14
(iii) P=2,Q=3
Explanation:
Q8.(i)The formula for potassium oxide is K2O. The potassium ion has a charge of 1+ and the oxygen ion has a charge of 2-. For an electrically neutral ionic compound the charges must balance. Therefore, there must be two k+ ions for every oxygen 2- ion.
(ii)Aluminum is an element and has a chemical symbol of Al. It has a common oxidation state of +3 and is a metal.
(iii)To combine these two ions together you must keep in the mind the charges. Since they are both either +1 or -1 they cancel eachother out to become --> NaOH
Q9.(i)The atomic number of oxygen is 8 as this element has 8 protons and 8 electrons. Number of protons or electrons determines the atomic number of an element and thus oxygen has 8 as it's atomic number. It is placed in the group 16 of the periodic table .
The atomic number is equal to the number of protons or the number of electrons. Substituting 13 atomic number and 14 for the number of neutrons. Thus; Atomic mass of aluminium =13+14=27u .
(ii)of protons + no. of neutrons. So, the no. of neutrons = 27 - 13 = 14
(iii) Oxygen has 8 electrons in its atom. The distribution of electrons is 2, 6. 2) The outer most shell consists 6 electrons, this number is hear to Hence the valency of oxygen is 8-6=2.
Atomic number of aluminium is 13 so its electronic configuration is 2, 8, 3. Since it has 3 electrons in its valence shell, it will lose 3 electrons to complete its octet hence its valency is +3.
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Answer:
the atomic number of p is 8 and q is 13