Revesion
1) Put ( right ) & ( wrong ) in front of these statement and correct the wrong one : -
1- Carbon is found in petroleum oil , saccharides and chiorophyll.
2- The chemical formula for Epsom salt is magnesium sulphate.
3- the elements exist in the same period have similar properties.
4- silver bromide is used in cooking utensils industry.
5- chlorine gas can undergoes sublimation process.
Write one importance for each of the following:-
1- Metalloids…………………………………………………………………………………………………………
2- Gieger counter …………………………………………………………………………………………..
Give reasons for :-
1- Semi-metallic elements are called semi-conductors.
2-Elements in group ( 1a ) are not founding elementary state.
3-Chlorine cl17 is monovalent , while magnesium Mg12 is divalent.
Mr.mohamed abo-mosalam