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atomic number
If you are thinking about the name , then the answer is random , but if you want to know where it will be on/in The PSE then its by the number of electrons they have (electronic configuration).
a semiconductor
It is considered an Alkali metal
silica
atomic number
scientists use taxonomy to classify and separate them into different groups
they classify the rocks by their texture and compisition
Binomial Nomenclature.
The scientists use the dichotomous key or the identification key to classify newly found organisms.shared characteristics.
their genome
The chart is a dichotomous key. It helps them classify things.
Scientists classify organisms by the dichotomous key. They classify by looking at if it moves or not, then they look at characteristics, then they can see what they are.
Radial symmetry
taxonomy.
to classify the elements mendeleev arranged the elements in increasing order of their atomic mass
scientists classify organisms into groups based on internal and external features.