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chapter 17 Powerpoint 1

how many elements are there 117 elements.
how can you see a molecule? It can be seen with an electron microscope.
what is the building blocks of atoms? mattter
what is a letter or letters that represent an element? chemical symbol
what percent of the universe is composed of dark matter? 23%
hydrogen is the lightest element and makes up what percent of the atoms in the universe? 90%
what is the lightest element? Hydrogen.
where are electrons located? orbiting around the nucleus.
what is the number of protons in the nucleus? atomic number
what charge do electrons have? negative charge
what makes up everything in the universe we see, feel, taste, hear, and smell? atoms
what are the ways atoms recycle? breathing in and out, scratching your skin, and coughing and sneezing.
In the 1800's who said matter was made of atoms because of studying chemical reactions? John Dalton
what is the most common molecule? H2O Water.
What is the mass of an atom primarily concentrated in? nucleus
How do you find the mass number? protons + neutrons
In 1827, what Scottish botanist studied pollen grains under a microscope? Robert Brown
Created by: 14_hbentrup