vocabulary
what does atom mean
the smallest particle of an element made of electrons, protons, and neutrons
what does Periodic Table of Elements mean
Periodic Table of Elements: a table in which all the known elements are arranged by properties and are represented by chemical symbols
how is the arrgenment of the periodic table based on
it is based on atomic number
did Marie Curie win a Nobel prize in Physics and Chemistry
true or false
true
Which statement is true about the Periodic Table?
A The Periodic Table is organized by physical properties. B The Periodic Table is organized by atomic weight. C The Periodic Table is organized by date of discovery. D The Periodic Table is organized by atomic mass.
the Periodic Table is organized by atomic mass
subatomic particles
particles that are smaller than the atom
what does properties mean
properties: physical and chemical characteristics of matter used to describe or identify a substance
Elements are composed of small
indivisible particles called atoms.
an atom is composed of protons and neutrons and nothing else
ture or false
false
it also containes electrons
Which two particles combine to make up the mass of an element?
A Electrons and protons B Neutrons and protons C Electrons and neutrons D None of the above
neutron and protons
what does element mean?
a pure substance composed of the same type of atom throughout
what does atomic mass mean
atomic mass: the mass of an atom, approximately equal to the number of protons and neutrons in the atom
what did James Chadwick discover
neutrons
The elements in the last column, Group 8A are known as nitrogen gases
true or false
false
they are called noble gas
Atomic mass of an element generally increases as
A you go up a group on the Periodic Table.
b you go left to right across the Periodic Table.
C you go right to left across the Periodic Table.
You go left to right across the Periodic Table.
what does neutron mean?
a neutrally charged subatomic particle located in the nucleus of an atom; contributes to the mass of the atom
what does valence electrons means
valence electrons: the electrons in the outermost energy level of an atom that influence how an element will react with other substances
the atom is composed of protons, neutrons, and electrons. These three particles are known as
subatomic particles
do the halogens include fluorine (F), chlorine (Cl), and bromine (Br).
true or false
true
1. What is the advantage of keeping elements organized using the Periodic Table?t
keeps it kneat
what does electrical charge mean?
a property of matter determined by the number of positively charged protons and negatively charged electrons in a material
what does bond mean
bond: any of several forms of electrostatic attraction between atoms that hold the atoms together
There are --- known elements in the world that are made up of atoms.
118
There are 150 known elements in the world that are made up of atoms.
false
there are only 118
describe an atom