4. Find the valency of the elements given below using electronic configuration on the basis of sub shell.
a) carbon
b) sulphur c) magnesium
d) potassium e) fluorine
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One student said that the investigation was not valid (a fair test). write a plan for the investigation that includes improvements to the method and apparatus

Two moles of potassium chloride and three moles of oxygen are produced from the decomposition of two moles of potassium chlorate, kcos3(s). write the balanced equation. how many moles of oxygen are produced from 12 moles of potassium chlorate

Which of the following pairs of elements is most likely to form an ionic compound? a oxygen and fluorine b sodium and aluminum c calcium and chlorine d nitrogen and sulfur