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METALS- characterized by their hardness luster and ability to conduct both heat and energy/electricity. metallic elements are solid at room temperature(except mercury)
NON-METALS- are the elements that don't posses metallic luster. nonmetallic elements are poor conductor of heat and energy/electricity. most of them are gases and solid at room temperature(except bromine which is liquid at room temp.)
METALLOIDS- metalloids has some characteristics of metals( they conduct electricity) and non-metals( they are brittle and soft) for example: silicon, it is a brittle solid but it conducts electricity
s, p, d, f- block elements: the periodic table is also divided into four blocks. these blocks are based on the electron configuration of elements.
Elements are organized on the table according to their atomic number , usually found near the top of the square. The atomic number refers to how many protons an atom of that element has. For instance, hydrogen has 1 proton, so it’s atomic number is 1. The atomic number is unique to that element. No two elements have the same atomic number .
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