Interpretation:
Element M and X has to be determined from the given data.
Concept Introduction:
According to physical and chemical properties, the elements can be further divided into metals, non-metals and metalloids.
In a group, the metallic character of an element increases from top to bottom whereas in a period, it decreases from left to right.
Nonmetals are elements that usually contain 4-8 outer shell electrons. A nonmetal can be easily broken, that is they are brittle. They cannot conduct heat and electricity.
Metals are elements that usually contain 1-3 outer shell electrons. They can conduct heat and electricity. Metals usually look shining and lustrous.
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