exam on unite one prep2

Mendeleev arranged the elements in ascending order according to ............., while Moseley arranged them ascendingly according to...........

The modern periodic table consists of ...... horizontal periods and ........ vertical groups

The strongest metal lies in the .....group, while the strongest nonmetal lies in the .....group

Mention the importance of liquified nitrogen

Which of the halogens is the most active

• Chlorine

• Bromine

• Fluorine

• Iodine

All of the following elements are from semi metals except

• Tellurium

• Silicone

• Boron

• Bromine

write the scientific term

the ability of the atom in covelent molecule to attract the electrons of the bond towords itself

write the scientific term

arrengement of the metals in descending order according to their chemical activity

Write the scientific term

Slides are used in the manufacture of computers

Write the scientific term

Element reacts in high temperature with only hot water vapour