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Question
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
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Solution
Atomic number 15
Electronic configuration (15): 2,8,5
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The sub atomic particle with negative charge is
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Define the atomic mass number of an atom.
Draw the orbital diagram of `""_20^40"Ca"^(2+)` ion and state the number of three fundamental particles present in it.
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Elements X, Y and Z have atomic numbers 6,9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
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]
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]
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]
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
