The atomic number of an element is 19. (a) Write the electronic configuration of the element and determine (i) the valency of the element and (ii) whether the element is a metal or non-metal. (b) Write the formula of the oxide of the element. (c) Is the element more reactive or less reactive than Na (atomic number 11). Justify your answer giving example.
The atomic number of an element is 16. Predict its valency
The atom of an element X has 7 electrons in its M shell (a) Write the electronic configuration of element X. (b) What is the atomic number of element X ? (c) Is it a metal or a non-metal (d) What type of ion will be formed by an atom of element X ? Write the symbol of the ion formed (e) What could element X be ?
The atomic number of an element variable valency.
The atomic number of an element having the valency shell electronic configuration 4s^2 4p^6 is
The atomic number of an element is 16. Predict the number of valence electrons in its atom
The atomic number of beryllium is 4 while that of oxygen is 8. Write down the electromic configuration of the two and deduce their valency from the same.
LAKHMIR SINGH & MANJIT KAUR-MODEL TEST PAPER 3-SECTION B
