Advertisements
Advertisements
प्रश्न
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Advertisements
उत्तर
| Atomic number | Number of protons | Number of electrons |
| Z | p | e |
| Nitrogen atom has | 7 Protens | 7 electrons |
∴ Atomic number [Z] = no. of protons [p] = no. of electrons [e]
Z = 7 = 7
∴ Atomic number of nitrogen is 7.
APPEARS IN
संबंधित प्रश्न
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
State modern periodic law.
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
How do the atomic radii of elements change as we go from left to right in a period of the periodic table?
Give the chemical formula of carbonic acid
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
Which of the following elements would lose an electron easily?
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
A and F
