Advertisements
Advertisements
प्रश्न
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Advertisements
उत्तर
The valence electrons in the same shell (outermost shell) increase progressively by one across the period. The first element hydrogen has one valence electron and helium has two valence electrons.
On moving from left to right in a period, valency increases from 1 to 4, then falls to one and ultimately to zero in the last group.
APPEARS IN
संबंधित प्रश्न
Give two example of group 1 elements.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
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?
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name the type of elements which have two outermost shell incomplete.
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
Complete the following flow chart.
Which of the following is the outermost shell for elements of period 2?
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Spot the error:
The elements of group 13 are called the carbon family.
