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Practice each question, then open the answer or worked solution.
Up to which element, the Law of Octaves was found to be applicable
The answer is (b) Calcium
Explanation:
Newland’s law of octaves applied to the elements with atomic mass up to 40 da which comes up to Calcium. After calcium, every eighth element possess properties similar to that of the first.
According to Mendeleev’s ′ Periodic Law, the elements were arranged in the periodic table in the order of
The answer is (c) increasing atomic masses
Explanation:
In Mendeleev ’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later
The answer is (a) Germanium
Explanation:
Mendeleev name unnamed elements as EKA- Boron EKA- Aluminium and EKA Silicon which were later replaced as Scandium, Gallium, and germanium respectively.
Which of the following statement (s) about the Modern Periodic Table are incorrect
(a) (i) only
(b) (i), (ii) and (iii)
(c) (i), (ii) and (iv)
(d) (iv) only
The answer is (b) (i), (ii) and (iii)
Explanation:
Elements in the Modern Periodic Table are arranged based on their increasing atomic number hence option i) is wrong. In modern periodic table atomic mass is not a criteria hence option ii) is wrong. Isotopes are given the same position in periodic table hence option iii) is wrong.
Which of the following statements about the Modern Periodic Table is correct:
The answer is (c) It has 18 vertical columns known as Groups
Explanation:
Modern periodic table have 18 groups and 7 periods. Columns are called groups and rows are called periods.
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
The answer is (b) B, C, D
Explanation:
Element with atomic number belongs to the first period and element B, C and D belong to the second period.
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
The answer is (c) A and C
Explanation:
A and C are fluorine and chlorine belongs to the same group.
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
The answer is (c) Group 18
Explanation:
Group 18 has its outermost shells completely filled hence element with electronic configuration belongs to group 18.
An element which is an essential constituent of all organic compounds belongs to
The answer is b) group 14
Explanation:
Carbon is an essential constituent of all organic compounds which belongs to group 14.
Which of the following is the outermost shell for elements of period 2?
The answer is (b) L shell
Explanation:
In period 18 there are two shells K and L