Advertisements
Advertisements
प्रश्न
What is the number of elements in the 1st period?
Advertisements
उत्तर
There are two elements in the first period.
APPEARS IN
संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 1 elements are called ...............
On the basis of electronic configuration, how will you identify the first element of a period?
Name the metals in the first twenty elements.
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
State the number of elements in Period 2 of the Periodic Table.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
______ and ______ are called inner transition elements.
On moving from left to right in a period in the periodic table, the size of the atom ______
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has variable valency and is a member of the Oxygen family (group 16).
