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Q19: Lithium is composed of two isotopes: lithium-6
Q39: <span class="ql-formula" data-value="( \sqrt { 6 }
Q85: The symbol for the element calcium is_.<br>A)Ca<br>B)C<br>C)Cm<br>D)Cu<br>E)Cl
Q91: Select the element that is an alkali
Q93: On the planet Melmac, in a galaxy
Q113: Elements in group IIA (2) are called
Q122: A horizontal row of elements in the
Q140: The radius of a sphere depends
Q168: <span class="ql-formula" data-value="r ( x ) =
Q273: Give the definition or an example of