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This question is designed to test a students knowledge of electronic configuration in elements, and their ability to use this knowledge to assign a reasoning to the trend given. The general trend is an i...

Number of particles of water = avogadro constant x amount in molTherefore6.02 x10²³ x 0.75= 4.515 x10²³There are 3 atoms in every molecule of water so we need to multiply the number ...

First ionisation energies decrease down groups in the Periodic Table:-larger atomic radius-increased nuclear charge is outweighted by increased shielding-reactivity increases down the group as it's easier...

Both Cl and I in Group 7. Both have 7 electrons in its outer shell and require 1 electron to obtain a full shell. Reactivity of these halogens correspond to its ability to gain an electron. Cl can gain an...

As you move down group 7 from fluorine to iodine, the reactivity of the elements decreases. The halogens are non-metals and when non-metals react with metals, they GAIN the electrons that the metals lose....