The Periodic Table can be used to quickly determine characteristics (number of valence electrons for example) of an element.
Chemical properties tell you how the element or compound is going to react during a chemical reaction.
The smallest unit of an element that maintains the properties of that element is the atom.
The element that would have properties most similar to the new element would be an element that lies in the same group as the new element. Specifically, the element with the most similar properties will lie directly above or below that element in the group.
there is no such element
An atom.
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Chemical properties tell you how the element or compound is going to react during a chemical reaction.
Element A and element B are the most likely to have similar properties because they belong in the same family, because if you know an element's family you can tell the number of valance electrons and the elements they react with. In periods, the properties are not alike, they slowly change in a pattern.
density
The smallest unit of an element that maintains the properties of that element is the atom.
The atom is the smallest unit of an element that has all the properties of the element.
The number of the protons in the nucleus of a chemical element is equivalent to the atomic number; the atomic number define the position of this element in the periodic table (group, period). And from these we can suppose the chemical properties of this element.
Elements in the same family, or group, have similar physical and chemical properties.
The element that would have properties most similar to the new element would be an element that lies in the same group as the new element. Specifically, the element with the most similar properties will lie directly above or below that element in the group.
there is no such element
the most important properties in an element is state at room tempreture