Review A-Level Edexcel Chemistry Group 7 trends through halogen boiling points, physical states, electronegativity and oxidising reactivity.
This question is about the elements in Group 7.
Explain the trend in electronegativity down Group 7.
(2)
(b) (i) State the meaning of the term electronegativity.
An explanation that makes reference to the following points:
- elements become less electronegative (down the group)
- the outer electron(s)/shell is further away from the (positive) nucleus (so the bonding electrons are less strongly attracted)
Allow decreases Allow descriptions using names of elements
Allow increased repulsion (from inner electrons) Allow more shielding (by inner electrons) Allow more (inner) shells of electrons Allow effective nuclear charge is lower Ignore other comments about nuclear charge Ignore size/radius of atom increases
Allow reverse argument Marks are independent