Advertisements
Advertisements
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.
Advertisements
उत्तर
Charge on the oil drop = 1.282 ×10-18C
Charge on one electron = 1.6022 × 10-19C
∴Number of electrons present on the oil drop
`= (1.282xx10^(-18)" C")/(1.6022 xx 10^(-19)" C")`
`= 0.8001 xx 10^1`
= 8.0
संबंधित प्रश्न
Explain the Mass number with example.
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
The mass number of an element is 23 and it contains 11 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
The atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?
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 :
What is the significance of atomic numbers in the modern Periodic Table?
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
An atom of an element has two electrons in the M shell.
What is the (a) atomic number (b) number of protons in this element?
What is meant by the 'atomic number of an element'?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
If an atom ‘A’ has atomic number 19 and mass number 39, state –
- Its electronic configuration.
- The number of valence electrons it possesses.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Oxygen – \[\ce{^16_8O}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
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. = 2, how many electrons does it have.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
An element ‘A’ has mass number 23 and atomic number 11. State the –
- no. of neutrons in its shell,
- electronic configuration of the element ‘A’.
Atomic number : ______ :: Mass number : Number of protons and neutrons.
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
‘Z’ is denoted by ______.
Mass No. 27 is for the element ______.
