Advertisements
Advertisements
प्रश्न
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
विकल्प
(i) and (ii)
(i) and (iii)
(ii) and (iii)
(ii) and (iv)
Advertisements
उत्तर
(ii) and (iv)
Explanation -
Mass number = p + n
Atomic number = p = e
APPEARS IN
संबंधित प्रश्न
In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 × 10-18C, calculate the number of electrons present on it.
Dalton said that ______ could not be divided.
(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.
(b) What is the relation between the atomic number and mass number of an element?
(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :
Sulphur has an atomic number 16 and a mass of 32.
State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 3, how many neutrons does it have.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
______ = No. of protons = No. of the electrons.
Mass No. 27 is for the element ______.
