Chemistry
Write the electronic configuration of the element 3517T.
(a) What is the group number of T?
(b) What is the period number of T?
(c) How many valence electrons are there in an atom of T?
(d) What is the valency of T?
(e) Is it a metal or a non-metal?
(f) State number of protons and neutrons in T.
Answer
The electronic configuration of 3517T is [2, 8, 7]
(a) Group number of T — VIIA [∵ it has 7 valence electrons]
(b) Period number of T — Third period [∵ it has 3 shells]
(c) Valence electrons — Seven [from electronic configuration]
(d) Valency of T is -1. [∵ it needs to gain one electron to complete its octet]
(e) T is a non-metal [∵ it has a tendency to accept electrons]
(f) Protons = 17, Neutrons = 18
Related Questions
This question refers to elements of the periodic table with atomic numbers from 3 to 18. In the table below, some elements are shown by letters, even though the letters are not the usual symbols of the elements.
3 4 5 6 7 8 9 10 A B C D E F G H 11 12 13 14 15 16 17 18 I J K L M N O P (a) Which of these is
(i) a noble gas
(ii) a halogen
(iii) an alkali metal
(iv) an element with valency 4
(b) If A combines with F, what would be the formula of the resulting compound?
(c) What is the electronic configuration of G?
The position of elements A, B, C, D and E in the periodic table are shown below:
Group 1 Group 2 Group 17 Group 18 – – – D – B C – A – – E (a) State which are metals, non-metals and noble gas in this table.
(b) State which is the most reactive (i) metal (ii) non-metal.
(c) Which type of ion will be formed by element A, B and C.
(d) Which is larger in size (i) D or E (ii) B or C.
In the periodic table, the elements of a same group have the same:
- Number of valence electrons
- Mass number
- Atomic number
- Number of electrons
The number of elements in the largest period of the periodic table is:
- 18
- 8
- 32
- 42