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secondary 2 | Maths
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Date Posted: 4 years ago
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a) Particles are ions if the number of protons and electrons are different, because that would mean that the particle has a net charge.
Ans: O Q
b) Noble gases belong in Group 0. For Olevels, those that you need to know are He (proton no. 2), Ne (proton no. 10) and Ar (proton no. 18)
Ans: M (Helium)
c) If they are the same element, they MUST have the same PROTON number. It is the proton number that determines what element it is.
Ans: N (Atom) O (Ion, has less electrons than protons)
d) Isotopes have same proton number but different neutron numbers.
Ans: L P
e) Metals are found in group 1 and 2 of the periodic table.
Ans: N (O is rejected because it is an ion, not an atom)
f) Particle O is an ion with charge +2 since it has 2 less electrons than protons. Chlorine has a charge of -1. Hence the chemical formula should be OCl2, to form a compound of net charge 0.
Ans: O Q
b) Noble gases belong in Group 0. For Olevels, those that you need to know are He (proton no. 2), Ne (proton no. 10) and Ar (proton no. 18)
Ans: M (Helium)
c) If they are the same element, they MUST have the same PROTON number. It is the proton number that determines what element it is.
Ans: N (Atom) O (Ion, has less electrons than protons)
d) Isotopes have same proton number but different neutron numbers.
Ans: L P
e) Metals are found in group 1 and 2 of the periodic table.
Ans: N (O is rejected because it is an ion, not an atom)
f) Particle O is an ion with charge +2 since it has 2 less electrons than protons. Chlorine has a charge of -1. Hence the chemical formula should be OCl2, to form a compound of net charge 0.
Thank u for elaborating the answer so detailedly
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