Este test está cronometrado.
Tienes 3 minutos para completar 7 preguntas de este test.
Do you use a STM to look at an atom
How many known atoms are there
123
118
What do you use to look at an atom
STM
ATM
How many elements are made in a lab
27
How many naturally found elements are there
91
100
In what order is the periodic table written in
largest to smallest
smallest to largest
Is Hydrogen a metal