Elements, Compounds, and Mixtures
What is an element?
An element is a substance made of one type of atom.
What is a molecule?
A molecule is 2 or more of the same atom held together by a bond.
What is a chemical bond?
A chemical bond is an attraction that holds atoms together.
How many elements are on the periodic table?
118
What is the middle of the atom called?
The nucleus.
What are the two types of mixtures?
Homogenous and Heterogenous.
How many atoms are in a molecule?
2 or more atoms.
What are the 4 types of chemical bonds?
The 4 types of chemical bonds are ionic bond, covalent bond, metallic bond, and hydrogen bond.
What did each scientist do the same?
They organized elements.
What makes up the nucleus?
Protons and neutrons make up the nucleus.
What is the difference between homogenous and heterogenous mixtures?
Homogenous is a mixture where you can't see the different parts while heterogenous you can see all the parts of the mixture.
What are elements organized on?
A periodic table.
What are the two types of Ionic bonds?
Positively charged ions and negatively charged ions.
What did John Newlands do?
He was the first to arrange the elements into a periodic table with an organized order of atomic masses.
What 3 things are part of the atom?
Protons, neutrons, and electrons make up an atom.
What is a compound?
A compound is a material formed by chemically bonding two or more chemical elements.
On the periodic table what else does the element tell you other then the name?
It tells you the atomic number, atomic weight, and symbol.
What are 2 properties of covalent bonds?
1. A covalent bond holds roughly 80 kcal/mol of energy.
2. Covalent bonds rarely break on their own after they have been formed.
Who created and when was the more modern periodic table created.?
In 1869, Russian chemist Dmitri Mendeleev created the framework that became the modern periodic table, leaving gaps for elements that were yet to be discovered. While arranging the elements according to their atomic weight.
Does the atomic structure look the same for every atom?
Not really, it would have different amounts of protons, neutrons, and electrons. But it would have the same structure/look where the electron cloud is and the nucleus is.
What element has a atomic number of 1, 2, and 3?
Hydrogen (1), Helium (2), and Lithium (3).
What is something elements and molecules have in common?
When a element combines, it forms a molecule.
What is an example of a hydrogen bond?
Water is an example of a hydrogen bond.
What are the horizontal rows called and vertical columns called on the periodic table?
The horizontal rows are called periods and the vertical columns are called groups.
What is the space where the electrons are?
The electron cloud.