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Q1 Week 8 Exam Atoms

QuestionAnswer
Each atom of a particular element always has the same number of _____. protons
Elements are organized on a chart called the Periodic Table of the ______. Elements
The number of _____ for an element can NOT change. protons
Atoms of the same element that contain different numbers of _____ are called isotopes. neutrons
The _____ number of an atom is the total number of neutrons plus protons in the atom. mass
To calculate the number of neutrons, subtract the atomic ____from the mass number. number
An ion is an atom that is no longer ____ because it has gained or lost electrons. cation
An atom with a negative charge is called a negative ion. This is also called an ____. anion
How does a neutral atom become a negative ion of the same element? It gains an electron
The atomic mass of an atom is equal to ____. the number of protons and neutrons
All matter is built up from basic particles called _____. atoms
There are three subatomic particles- protons, _____, and electrons. neutrons
_____ and neutrons are found in the nucleus of the atom. Protons
Electrons are found in the ____ space outside of the nucleus. empty
Neutrons are _____ particles, they have no electrical charge. neutral
A neutral atom will have an equal number of protons (positively charged particles) and _____ (negatively charged particles). electrons
The atomic number is the number of _____ in the nucleus of an atom. protons
No two elements have the same number of protons so _____ have unique chemical and physical properties. elements
The ____ number of an atom is the sum of the number of protons and neutrons in an atom’s nucleus. mass
To find mass number, simply add up the protons and ____. neutrons
When we find the atomic mass number, we round it to the nearest ____. whole number
Since the atomic number equals the number of protons & the mass number is the number of protons + neutrons, we subtract the atomic ____ from the atomic mass to find the number of Neutrons. number
Atoms that have the same number of protons but different numbers of neutrons & mass numbers. isotopes
In Science, matter refers to a substance that has _____ and occupies space. mass
The ______ theory explains that matter is composed of tiny units known as atoms. atomic
Who was the Greek philosopher introduced the idea of atom as the basic building block of matter? He gave them the name atomos. Democritus
______ did not believe in the atomic theory. He thought that all materials on Earth were not made of atoms, but of the four elements, Earth, Fire, Water, and Air. Aristotle
Around 1800, the English chemist John _____ brought back Democritus’ ancient idea of the atom. Dalton
In Dalton's theory he said, atoms are the _____ particles of matter. They cannot be divided into smaller particles. They cannot be created, or destroyed. smallest
Dalton also said in his theory that all atoms of the same element are alike and have the same _______. mass
It wasn’t until _____ that a scientist named Joseph John (J. J.) Thomson discovered that there are smaller particles within the atom. 1897
Thomson called the particles he discovered “_______,” but they were later renamed electrons. corpuscles
Ernest _______ was a student of JJ Thomson. He aimed a beam of alpha particles (radioactive) at a sheet of very thin gold foil. Rutherford
Rutherford called the area of concentrated positive charge that he found in his gold foil experiment the ______. nucleus
Niels Bohr was a student of Rutherford. In 1913, Bohr published a description of a more detailed model of the atom. His model identified more clearly where _____ could be found. electrons
Created by: user-1727869
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