17th October 2019

seattlepi
18

How can scientists identify an element?

Each natural element has a characteristic light spectrum that helps identify it in samples of unknown substances. Spectroscopy is the practice of examining spectra and comparing them to those of known elements. Using spectroscopy methods, scientists can identify pure substances or compounds and the elements in them.

Just so, what determines the position of an element in the periodic table?

The periodic table is a tabular display of the chemical elements organized on the basis of their atomic numbers, electron configurations, and chemical properties. Elements with the same number of valence electrons are kept together in groups, such as the halogens and the noble gases.

What does the location of an element on the periodic table tell you?

The periodic table is a systematic arrangement of the elements. They are arranged according to their atomic number, the number of protons (which in the case of atoms is also the number of electrons) of each atom. Some of the properties of the elements can be predicted given their location in the periodic table.

How do you identify an atom?

The atomic number is the number of protons is the atomic number. In a neutral atom this number is also the number of electrons. In the molybdenum example above all of these numbers are 42. Protons and neutrons each have a mass of one and electrons a mass of zero.
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