Temporary hardness can be dealt with using boiling water(Calcium hydrogen carbonate) but Permanent won't so you need to use washing soda instead(sodium carbonate) or Ion exchange resin
they send the radiation through the cords
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Explanation:The lewis structure of ammonia shows that nitrogen is surrounded by four electron pairs.In term of electron repulsions model,the tetrahedral structure gives maximum separation .There is one lone pair electrons on nitrogen which replels the bonding pairs with the result that angles is reduced from 109 to 107.In term of hybrid orbital.model ,nitrogen utilizes is three of four sp3 orbitals to form sigma bond with three hydrogen atoms having one non bonding orbital on nitrogen.
Answer:
emission at a high speed or energy which often forms electrons
It will belong to the metals because metals bond with nonmetals like chlorine to form ionic compounds