g1,g7

how do g1 ,metals react with oxygen

g1 metals react very rapidly with oxygen

explaint rend in g1

as you go down g1 ,reactivity increases and mp and bp decrease

explain trend in g7

as you go down in g7,reactivity decreases and mp and bp increasee

why _ is more reactive than iodinee for e.g

(chlorine’s) outer electrons closer to the nucleus,(so) the chlorine nucleus has greater attraction for outer electrons ,(so) chlorine gains an electron more easily

why _ is LESS reactive than iodinee for e.g

• less reactive,

• chlorines nucleus has smaller attraction for outer electrons

• so chlorine gains an electron less easily

• less sheilding of outer electron

(b) Explain the trend in boiling points of the halogens shown in Table 1.

(boiling point) increases (down the table / group) 1 (because)

(because) the size of the molecule increases 1 (so) the intermolecular forces increase in strength allow

(so) the forces between molecules increase (in strength) 1

(so) more energy is needed to overcome the intermolecular forces

) Explain why the reactivity of the halogens decreases going down the group.

) (going down the group) the outer electrons become further from the nucleus,

(so) the nucleus has less attraction for the outer electrons

(so) an electron is gained less easily

as we move ____ g1 metals react more ____

as we move down g1 metals react more rapidly

describe what happens when g1 for e.g lithium reacts with water with green indicator to purple

lithium reacts with water - effervesence meaning a gas produced ,universal indicator is purple so its alkaline solution

state equation for metals reacting with hydrogen and a e.g

metal + water + metla hydroxide + hydrogen

sodium + water → sodium hydroxide + hydrogen

one reason

as we go down g1, the radius of the atoms increase so theres a greater distance between the positive nucleus and negative outer electron

the outer electron is less attracted to the positive nucleus

2nd reason

sheilding: the outer electron is repelled by the electrons in the internal energy levels,decreasing the attraction between the nucleus and outer electron

as we move ___ g1 elements have ___ electrons in the __ ____ ____

as we move down g1 elements have more electrons in the internal energy levels meaning sheilding inc as we move down group 1 making the outer electron easier to loose

as we move down g7 what happens to the mp and bp and molecules size

as you go down reactivity decreases,mp and bp increase as we move down g7,molecules get bigger moving down g7

when halogens react with metals they form ?

when halogens react with metals they form ionic compounds

when a halogen reacts with a metal the halogen atom gains what forming what ion

when a halogen reacts with a metal the halogen atom gains 1 electron forming 1- ion

why chlorine is less reactive than flourine

• less reactive,

• gains an electron less easily

• (cuz of a greater distance between nucleus and outer electron so electrons less attraactedd to positive nucleus in cl atom comp to f atom

• grater sheilding of outer electron

• (more electrons in internal energy levels,electrons in internal energy levels repel the outer electrons than in fl atom)

a more ___ ______ displace a___ ____ from an ____ _____ of its salt

more reactive halogen displace a less reactive halogen from an aqeous solution of its salt

e.g of displacement reaction sodium bromide + flourine →

sodium bromide + flourine → sodium flouride + bromine

• flourine is higher then bromine so its more reactive,displacing it

• bromine less reactive

pottasium ioidide + chlorine ->

pottasium ioidide + chlorine → pottasium chloride +iodine

g1 properties

soft realtively

low metals,

low density,

react rapidly with oxygen,chlorine,water,

forms 1+ ions charge

trans metals prop

hard,strong emtals

.high mp

,high density

,much less reactivity than g1 metals with oxygen ect,

forms colorless compounds

,froms ion with diff charges

catylysts

rule for reactivity

the more further the electron shells are from the nucleus,the least reactive it is ie chlorine is less reactive than flourine as more shells making it hard to gain electron and more down in the group