Strand I: Level 7-8 Contrast the properties of Alkali metals and alkaline earth metals.
Question 6
6.
Question 7
7.
Question 7: strand III Interpret Level 7-8
Thermo cups are designed to keep liquids hot inside them for a long time and prevent the leakage of heat outside, they are made of 2 layes filled with air between them.
Why do you think air is used to fill the space between these 2 layers? Verify your answer.
Question 8
8.
Using the periodic table of elements find out the following about calcium:
a- the period number.
b- the group number.
c- the type of the element.
The first periodic table arranged elements in order of,,,,,,,,,,,,,,,,,,,,,,
increasing atomic mass.
decreasing atomic mass.
increasing atomic number.
Elements that are located in the same _______________ have similar properties?
period
group
period and group
A majority of elements on the periodic table are .................................
metals
non- metals
noble gases
metalloids
non-metals are sometimes called ………….. because they do not conduct heat or electricity well
conductors
insulators
semi-conductors
helium
. The metal which is liquid at room temperature is:........................