Advertisements
Advertisements
Question
Match the atomic number 2, 4, 8, 15 and 19 with each of the following
1) A solid non metal belonging to the third period.
2) A metal of valency 1.
3) A gaseous element with valency 2.
4) An element belonging to Group 2
5) A rare gas.
Solution
| Atomic number | |
| A solid non-metal belonging to the third period | 15 |
| A metal of valency 1 | 19 |
| A gaseous element with valency 2 | 8 |
| An element belonging to Group 2. | 4 |
| A rare gas | 2 |
APPEARS IN
RELATED QUESTIONS
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7 electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.
Consider two elements 'A' (Atomic number 17) and 'B' (Atomic number 19) :
(i) Write the positions of these elements in the modern periodic table giving justification.
(ii) Write the formula of the compound formed when 'A' combines with 'B.'
(iii) Draw the electron dot structure of the compound and state the nature of the bond formed between the two elements.
Differentiate between Normal elements and Transition elements.
In the following set of elements, one element does not belong to the set. Select this element and state why it does not belong:
Oxygen, Nitrogen, Carbon, Chlorine, Fluorine
Fill in the blank in the following statement:
On going down in a group in the periodic table, the metallic character of elements ...............
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
Why are noble gases placed in a separate group?
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
Moving down in the second group, number of valence electrons ______.
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
