Chemistry Flashcards
How to find density?
Mass/Volume
Almost all of an atom’s mass is found in its—?
nucleus
where is the nucleus located in the atom?
The center
An atom’s nucleus can contain two types of particles, what are they?
Protons and neutrons
The nucleus of every atom contains how many protons?
one or more protons.
Which has and not has an electrical charge? (proton and neutron)
Proton has electrical charge and neutron doesn’t.
Where is the nucleus of and atom located and what is it made up of?
A nucleus of an atom is located at the center and is made up of protons and neutrons.
what are electrons?
What kind of charge do they have?
Electrons are fast moving particles around the nucleus.
Negative charge
What are 2 facts about electrons?
1) Each electrons has a negative electrical charge
2) An electron is much smaller and lighter then neutrons or protons.
The number of protons in an atom is known as its—?
atomic number
What is an atom?
Atoms are tiny pieces of matter that make up all substances around you.
what are the three types of particles that make up an atom?
Neutron, Proton and Electron
When two atoms have the same atomic number they are classified as the same–?
Chemical element
Define Composition
The chemical element that makes up a substance
Define arrangement in a chemical substance
The order and shape in which the atoms are bonded together in a substance
Which atom usually has only 1 proton and no neutrons?
Hydrogen
What is a covalent bond?
A covalent bond is a bond generally between two non metals where the electrons are SHARED.
What is an ionic bond?
A covalent bond is a bond generally between a metal and non-metal where the electrons are TRANSFERRED.
How many neutrons does a hydrogen usually have?
Can it have more than that?
0
Yes. A hydrogen atom can have 0, 1 or 2 neutrons. However they are very rare.
When an atom can have different number of neutrons, what are those variations called? (i.e. a hydrogen atom can have 0 or 1 or 2 neutrons)
Isotopes.
Which particles are used for calculating atomic mass?
protons and neutrons
Why aren’t electrons used in calculating atomic mass?
Electrons are very very very light. Almost weightless
Why do atomic mass numbers have decimals? Why aren’t they just integers?
Atomic masses are calculated with weighted average masses from different isotopes of an atom.
