A positively charged subatomic particle
What is a proton?
A category of elements which excludes B, C, N, O, F, Ne, AR, Cl, S, P, Br, Kr
What are metals?
A negatively charged particle
What is an electron?
The region where the protons and neutrons are found in an atom
What is the nucleus?
A subatomic particle that has almost no mass
What is an electron?
A mixture in which the composition is not uniform throughout
What is a heterogenous mixture?
An sample in which all particles match each other
What is a pure substance?
Number of valence electrons in one atom of Lithium
What is one?
What is an isotope?
Name of the compound SeF
What is Selenium Monoflouride?
When two or more nonmetal elements are chemically combined
What are covalent bonds?
Na
What is the element symbol for Sodium?
What is an ion?
The most stable elements on the Periodic Table
What are the noble gasses (group 18)?
A chemical combination of a metal and nonmetal
What is an ionic bond?
Who invented the modern periodic table?
Who is Dimitri Mendeleev?