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What value increases by exactly one from element to element, when moving left to right across a row of the periodic table? atomic number
What subatomic particle has a negative charge? electron
Positive charges are found concentrated in the _____ of the atom. center (nucleus)
The number of protons in one atom of an element is that element's _______ atomic number
To find the number of neutrons in an atom, what would you do? subtract atomic number from mass number
Why do gases take up a lot of space? because their molecules have very little attraction for one another
______ exist as single atoms rather than as molecules. noble gases
____ ________ are extremely reactive because they have one valence electron that is easily removed to form a positive ion. alkali metals
Carbon and other nonmetals are found in which area of the periodic table? right side
What are located in the left-most column of the periodic table? alkali metals
As you move from left to right across a row, the number of valence electrons ______ increases
The tendency of an element to react is closely related to the number of ______________ in atoms of the element. valence electrons
The region in which an electron is most likely to be found is called an ___ orbital
An atom's mass number equals the number of ______ plus the number of neutrons. protons
Oxygen's atomic number is 8. This means that an oxygen atom has eight _____ in its nucleus. protons
Elements can be classified as metals, nonmetals, and ________ metalloids
What 2 things are found in the nucleus of an atom? protons & neutrons
In Bohr's model of the atom, _________ move in fixed orbits around the nucleus. electrons
The pattern of repeating properties of elements revealed in the periodic table is known as the ___________ periodic law
The order of elements in the periodic table is based on the number of _______ in the nucleus protons
Atoms of elements that are in the same group have the same number of __________ valence electrons
What is unique for any given element? the number of protons
What accurately represents the arrangement of electrons in Bohr's atomic model? electrons travel around the nucleus in fixed energy levels with energies that vary from level to level
Mendeleev arranged the know chemical elements in a table according to increasing ______ mass
At room temperature, none of the metals are _____ gases
An electron has far less _______ Than either a proton or neutron. Mass
How are electrons arranged in Bohr’s atomic model? Electrons travel around the nucleus in fixed energy levels with energies but very from level to level
At room temperature none of the metals are _______ Gases
_______ on the periodic table contains the Most reactive non-metals. Group 7A
What is The number of valence electrons in atoms of the element is closely related to? The tendency of an element to react
Which element is found in most of the compounds in your body except for water? Carbon
What are elements that can conduct heat and electricity under certain conditions called? Semi conductors
What element is an alkali metal? Sodium
According to modern atomic theory it is nearly impossible to determine and electrons exact_____ Position
According to Bohrs theory , an electrons path around the nucleus defines it’s ________ Energy level
____________ Stated that every element was made of Atoms that could not be subdivided, Atoms of the same element are alike, and Atoms can join to form molecules. Dalton’s Atomic theory
Created by: dcrovato