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Explain some trends when going down Group 7 of Halogens in the Periodic Table

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 it...
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Explain the difference in reactivity of the halogens as group 7 is descended.

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 become...
TA
Answered by Tomos A. • Chemistry tutor
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Decribe, in terms of electrons ,what happens when a sodium atom reacts with a chlorine atom to form sodium chloride.

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 sodi...
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Answered by Seyi F. • Chemistry tutor
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Nitrogen has an atomic number of 7 and mass number of 14, an isotope of nitrogen has a mass number of 17. Explain what an isotope is and state how many electrons, protons and neutrons this isotope has?

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.
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Answered by Michael D. • Chemistry tutor
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Which is more reactive, chlorine or iodine. Explain why. (4 marks)

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 nuc...
ML
Answered by Maya L. • Chemistry tutor
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