Advertisements
Advertisements
प्रश्न
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]
उत्तर
- 9A 20B 10C
Atomic number of:
A = 9 = number of electrons = 2, 7
B = 20 = number of electons = 2, 8, 8, 2
C = 10 = number of electrons = 2, 8
(1) A non-metal = A
(2) A metal = B
(3) Chemically inert = C - Compound formed is A1−, B2+
APPEARS IN
संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
The atomic number and the mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement.
FILL IN THE BLANK
Rutherford won the Nobel Prize in 1908 for his investigations in the field of ......................
Name the particles which actually determine the mass of an atom.
The atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?
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]
What is atomic number?
The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,
- what will be the ratio of their sizes?
- If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
