Advertisements
Advertisements
प्रश्न
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
Advertisements
उत्तर
Electronic configuration of element with atomic number 12 is:
K2 L8 M2
There will be 2 electrons in the K shell, 8 electrons in the L shell and 2 electrons in the M shell of its atom.
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.
Write true or false for the following statement
An atom on the whole has a positive charge.
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
- Has four electrons in its valence shell?
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one:
- forms anion – negative ion;
- forms cation – positive ion;
- has 4 electrons in the outermost orbit. [Y, Z, X]
Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
- State which one is
(1) a non-metal,
(2) a metal,
(3) chemically inert.[A,B,C] - Write down the formula of the compound formed by two of the above elements.[BA2]
What is atomic number?
