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Going down Group 7 in the period table, the mass number increases, so the element becomes heavier. The period increases so the number of shells increase, though they all still require one electron to fill...
The halogens become less reactive as the group is descended. The halogens react by accepting an electron into its outer shell from another atom. As the halogens are descended, the outer electron shell bec...
This is an example of ionic bonding. The sodium atom loses an electron to become a positive ion . This electron is then gained by the chlorine atom which becomes a negative ion. These two ions then form s...
An isotope is an derivative of an element that differs from its original type in the number of neutrons it has. N(17) has 7 electrons, 7 protons and 10 neutrons.
Chlorine is more reactive.Less shielding - Chlorine has fewer shells so it's outer electron is closer to the nucleus (where as iodine has greater shielding (more shells) so increased distance between the ...
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