Question

ﺃﻳﺶ ﺛﺎﻧﻲ ﺍﻛﺜﺮ ﻋﻨﺼﺮ ﻣﻮﺟﻮﺩ ﻓﻲ ﺍﻟﻜﺮﺓ ﺍﻟﺎﺭﺿﻴﻪ ﺑﻨﺴﺒﺔ 28%

Answer 1

سيليكون

Answer 2

http://www.isalna.com/67929/%EF%BA%83%EF%BB%B3%EF%BA%B6-%EF%BA%9B%EF%BA%8E%EF%BB%A7%EF%BB%B2-%EF%BA%8D%EF%BB%9B%EF%BA%9C%EF%BA%AE-%EF%BB%8B%EF%BB%A8%EF%BA%BC%EF%BA%AE-%EF%BB%A3%EF%BB%AE%EF%BA%9F%EF%BB%AE%EF%BA%A9-%EF%BB%93%EF%BB%B2-%EF%BA%8D%EF%BB%9F%EF%BB%9C%EF%BA%AE%EF%BA%93-%EF%BA%8D%EF%BB%9F%EF%BA%8E%EF%BA%AD%EF%BA%BF%EF%BB%B4%EF%BB%AA-%EF%BA%91%EF%BB%A8%EF%BA%B4%EF%BA%92%EF%BA%94-28%25

Answer 3

السيلكون

Answer 4

الهيليوم