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Atoms,Elements Vocab

questions and vocab.

most common substances in the universe are? 1. Hydrogen 2. Helium 3. Oxygen 4. Carbon
99% of the mass of a human body are made up of (3)` 1. Oxygen 2. Carbon 3. Hydrogen
Most common elements in earths crust? 1. Oxygen 2. Silicon 3. Aluminum 4. Iron
composition of air and their symbols Nitrogen N2-Oxygen O2-Argon Ar- Carbon dioxide CO2
In order what is shown on an element key? 1. atomic number 2. element symbol 3. Element name 4. atomic mass
a____ is involved in the transfer or sharing of electrons valence electrons
a_______is a positevely cahrged particle in the nucleus proton
an elements_______is its row in the periodic table period
the central core of an atom is called its nucleus
a______carries a negative electral charge, and is located outside an atoms central core electron
Mendeleev was the first to arrrange the elements according to their _________ in the periodic table of elements properties
Elements in a _______ or ________ of the periodic table have similar characteristics family or group
a _____ is a particle in the nucleus that has no charge neutron
Scientists use the __________to measure the mass of the particles within the atom atomic mass unit
What did Dmitri Mendeleev reconize in 1869? he reconized a hidden pattern within the elements
What is the atomic mass of an element? all the isotoypes in the element
when do patterns appear in the periodc table of elements? when arranged in increasing atomic mass
what does the word periodic mean? regular repeated pattern
what are the three basic parts of an atom protons, neutrons and electrons
what does the nucleus contain? protons and neutrons
e- electron
p proton
n neutron
anything that has weight and takes up space matter
a basic substance element
the "building blocks" of matter atoms
particles inside the nucleus protons ans neutrons
the number of protons in a nucleus atomic number
terms that refer to the elements in a column of the periodic table family and group
elements in each group have similiar characteristics
an atom is made up of smaller particles called subatomic particles
what do we call the smallest unit of an element? an atom
What are electrons? tiny subatomic particles that swarm around the atoms nucleus
what does subatomic mean? smaller than an atom
what kind of electrical Charge do electrons have? negative
what kind of electrical charge do neutrons have? none
what is a molecule? two or more atoms bound together
what is the periodic table? a table defining all elements
the word atom comes from an ancient greek word meaning tiny
where can you find the electrons in an atom? swarming around the nucleus in distinct orbits called shells
about how big is an atom? one ten-millionth of a millimeter
how are elctrons arranged in an atom? in energy levels
where is most of the atoms mass? In the nucleus
which scientist is credited with discovering the atom? j.j. thompson
Created by: amanda:)