Advertisements
Advertisements
प्रश्न
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
उत्तर
Three shells indicate that the element belongs to the third period.
Three valence electrons indicate that the element belongs to the third group.
APPEARS IN
संबंधित प्रश्न
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
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.
How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?
Given alongside is a part of the periodic table. As we move vertically downward from Li to fr?
| Li | Be |
| Na | |
| K | |
| Rb | |
| Cs | |
| Fr | |
| rA | Ra |
What happens to the size of atoms?
Name two elements you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
How many elements are there in period 2?
Use the letters only written in the Periodic Table given below to answer the questions that follow:
(a) State the number of valence electrons in the atom J.(b) Which element shown forms ions with a single negative charge?
(c) Which Metallic element is more reactive than R?
(d) Which element has its electrons arranged in four shells?
Arrange the following as per the instruction given in the bracket
He,Ar,Ne (Increasing order of the number of electron shells)
Formula of ion of A is A2+. Element A probably belongs to ______ group.
Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?
