Chemistry
and are symbols of two isotopes of magnesium. (a) Compare the atoms of these isotopes with respect to : (i) the composition of their nuclei. (ii) their electronic configurations. (b) Give the reason why the two isotopes of magnesium have different mass numbers.
Related Questions
Sulphur has an atomic number of 16 and a mass number of 32. State the number of protons and neutrons present in the nucleus of sulphur.
Give a simple diagram to show the arrangement of the electrons in an atom of sulphur.
Five atoms are labelled V to Z
Atoms Mass Number Atomic number V 40 20 W 19 9 X 7 3 Y 16 8 Z 14 7 (i) Which one of these atoms (1) contains 7 protons; (2) has an electronic configuration 2, 7 ?
(ii) Write down the formula of the compound formed by atoms X and Y.