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प्रश्न
State the group and period, of the element having three shells with three electrons in valence shell.
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उत्तर
If there are three shells, the element belongs to the third period. An element with three valence electrons belongs to the 13 group.
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संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Name two elements in Alkali metals.
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Compare Modern Periodic Law with Mendeleev's Periodic Law.
______ is the longest period in the periodical table.
Explain the position of hydrogen in the periodic table.
