Which of the following are always at second trophic level of food chains? |
Carnivores, Autotrophs, Herbivores. |
Given below are some elements of the modern periodic table. Atomic number of the element is given in the parentheses: |
A(4), B(9), C(14), D(19), E(20) |
(a) Select the element that has one electron in the outermost shell. Also write the electronic configuration of this element. |
(b) Which two elements amongst belong to the same group? Give reason for your answer. |
(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius? |
Identify A, B and C in. the given diagram and write one function of each. |
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