Atoms, molecules, compounds Flashcards
What does a nucleus contain?
Contains protons and neutrons
3
Li
7
What is the atomic mass, number and symbol?
How many protons, neutrons and electrons are there?
1) atomic number: 3
Atomic mass: 7
Symbol: Li
Protons: 3
Electrons: 3
Neutrons: 7-3= 4
What is a compound?
A compound is a molecule that contains at least two different elements
What is a molecule?
a group of atoms bonded together
What is an atom?
Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules
Atoms are composed of what
They are composed of particles called protons, electrons and neutrons.
True or false
Atoms are the smallest particles of an element that have the chemical properties of that element.
True!!!
Where are the protons neutrons and electrons located in an atom?
Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus.
Table salt particles can be separated into two separate substances, sodium and chlorine. Is table salt an element?
No it’s a compound element. Table salt is made up of two elements: sodium and chlorine which makes it a compound.
What is a molecule? Give an example
When two or more atoms join together. For example, water. It consists of two hydrogen atoms and one oxygen atom.
Baking soda Is NaHCO3
How many different elements are in baking soda?
How many atoms are in one baking soda molecule?
There are 4 different elements (Na, H, C, O)
There are 6 atoms
Compound or element? Ca O2 HCI NaCI
Element
Element
Compound
Compound
True or False?
All molecules are compounds but not all compounds are molecules
All compounds are molecules but not all molecules are compounds
