1. What are periods in the periodic table?(1)
2. Write two examples for transition and inner
transition elements. (2)
3.Why noble gases are inert in nature? (1)
4. Which is the last element in the periodic tab
5. What are metalloids and give two examples.
6. Write two examples for alkali and alkaline ea
metals. (2)
7. How many groups are there in periodic table
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Answer:
1)periods are horizontal rows in a periodic table. periodic table contains 7periods.
2)examples of Transition element are manganese ,iron,cobalt, aluminum
examples of inner transition elements are thorium ,actinium etc.....
3)noble gases are inert in nature because it has a completly filled outermost shell as a result it is not reactive.
4)last element is unoctium which is the 118th element
5)metaloids are elements which exhibit the properties of both metals and non metals . examples are antimony tellurium, polonium etc....
6)examples of alkali metals are lithium, sodium etc...
examples of alkali earth metals are beryllium, calcium, radium etc...
7)the total number of groups in periodic table is 18
Step-by-step explanation:
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