Elements are a chemical substance composed of atoms of two or more different types of atoms substances that are made up of only one type of atom subatomic particles with a positive charge only found on earth
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Elements and Compounds are all around us. (1)__________ are made up of atom or atoms of the same kind. They are the simplest type of matter and cannot be broken down into components. Each element is made entirely from (2)_______ type of atom. Each element is unique and no two elements have the same set of (3)__________. Some are in the same state but they have (4)__________ properties. Some elements are (5)________ like iron, gold and silver. Others are (6)_______ like Nitrogen, Oxygen and Hydrogen. There are elements that are (7)___________ like Boron, Silicon and Germanium.(8) _________ are combination of (9)__________ or (10)____________ elements like water which is a combination of Hydrogen and Oxygen; salt which is made up of sodium and chlorine; and rusts formed when an iron reacts with oxygen. Compounds can be broken down into it’s (11)______ through a (12)__________ process and formed when two elements are combined together. It has unique properties that are different from the properties of the elements that make them up.
Sikandar B.
Elements and Compounds Substances which can not be broken down into simpler substances by chemical reactions are called elements Most substances are chemical combinations of elements. These are called compounds. - Compounds are made of elements - Compounds can be broken down into elements - Properties of the compound not related to the properties of the elements that compose it - Same chemical composition at all times
Nicole S.
Atoms of two elements, one above the other in the same group, are in the ground state. An atom of element Q has two $s$ electrons in its outer shell and no $d$ electrons. An atom of element $\mathrm{R}$ has $d$ electrons in its configuration. Identify elements $\mathrm{Q}$ and $\mathrm{R}$.
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