5(iii)
Answer the following questions based on the information provided for the elements P, Q and R.
- P : atomic number = 19
- Q : electronic configuration = 2, 6
- R : has a tendency to gain one electron
(a) Write the electronic configuration of element P.
(b) What is the valency of element Q?
(c) Is element R a metal or a non-metal?
(d) Which period does P belong to?
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(a) Electronic configuration of P (atomic number 19) = 2, 8, 8, 1
(b) Q has 6 valence electrons and gains 2 electrons to complete its octet, so its valency is 2.
(c) Element R has a tendency to gain one electron, so it is a non-metal.
(d) P has 4 electron shells (2, 8, 8, 1), so it belongs to Period 4.