What are the trends in reactivity down Group 1 and 7?
The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group. This is the opposite trend to that seen in the alkali metals in Group 1 of the periodic table . Fluorine is the most reactive element of all in Group 7.
What are the trends going down the group for Group 1?
Going down the group, the first ionisation energy decreases. There is more shielding between the nucleus and the outer electrons and the distance between the nucleus and the outer electron increases and therefore the force of attraction between the nucleus and outer most electrons is reduced.
What are the trends in Group 1?
Explaining the trend The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.
What are the trends of Group 7 elements?
The melting points and boiling points of the halogens increase going down group 7….This is because, going down group 7:
- the molecules become larger.
- the intermolecular forces become stronger.
- more energy is needed to overcome these forces.
Why do Group 1 and 7 react so easily?
Group 1 elements get more reactive down the group becasue with each step down the group the number of full electron rings increases by 1 and the outermost electron is further away from the positive nucleus.
What are the differences between group 1 and 7 elements?
As you go down group 1 (the alkali metals) in the periodic table, the elements get more reactive. As you go up group 7 (the halogens), again the elements get more reactive.
What is the trend in Colour in group 7?
Colour. The halogens become darker as you go down the group. Fluorine is very pale yellow, chlorine is yellow-green, and bromine is red-brown. Iodine crystals are shiny purple – but easily turn into a dark purple vapour when they are warmed up.
Why Could hydrogen be placed in Group 1 or 7?
Hydrogen is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals. Hydrogen has a much smaller electron affinity than the halogens.
What is the trend in Colour in Group 7?
What are the properties of group 8 elements?
Let’s take a moment to review some of the properties these nobles of the element world share:
- They are inert gases located on the right of the periodic table.
- They have a full-set of valence electrons, so they’re stable.
- They are colorless, odorless and tasteless.
- They have low melting and low boiling points.
What are the differences between group 1 and group 7?