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Which of the following is not a correct use of radioisotope?
The maximum number of electrons can be filled into the second shell of an atom is _____.
The diagram shows an atom with 18 electrons. If 1 more electron is added into the atom, the atom will fall into which shell?
The figure shows an atom with 14 electrons. The electron arrangement of the atom is
The figure shows the symbol of a carbon atom. Find the arrangement of the electrons of the carbon atom.
One oxygen atom has 8 protons, 8 neutrons and 8 electrons. Which of the following statement is correct about oxygen atom?
The table below describes the structures of four particles.
|Number of electrons||8||X||11||Z|
What are the correct values of X, Y and Z?
The table below shows the number of protons for elements P, Q, R, S and T.
|Element||Number of protons|
Which of the following pair of elements have the same number of valence electrons in their atom?
Table below shows the number of neutrons, protons and electrons of particles X and Y.
Which of the following is true about X and Y?
The nucleus of an atom contains