admin / January 31, 2018
Question Answer
The periodic table is arranged like a calendar
A calendar organizes days, weeks,and months
Common days are together in a column
What is a quark? sub-sub atomic particle
One week is together in a row
In a periodic table, the column is called a group or family
Each group or family shares common characteristics
Each row is called a period
The elements have a variety of properties- one is chemical activity
Some elements are very active or reactive- What does this mean? They combine easily with other elements
Some elements are not reactive- What does this mean? They cannot react with other elements
The elements in the right column are called The Noble Gases
What do the Noble Gases do? They never combine with any other elements
When did Dmitri Mendeleev observe the properties of elements and record what? (date and what he recorded) 1869 and chemical and physical properties
Mendeleev found that some elements had ______ characteristics the same
These two elements irritate the eyes. Cl and Fl
These to metals are shiny( but tarnish easily) Ag and Cu
dulling appearance of a shiny metal when it oxidizes tarnish
Metals which oxidize easily are silver, brass, bronze, copper, and iron
Mendeleev recorded ________ and________. atomic mass and bonding power
Atomic mass means the density of an atom
The Atomic mass is based on hydrogen which is the lightest element
Atomic mass unit is the unit used to measure atoms based on ___________ which has the AMU of __ Hydrogen; 1
Bonding power (which means____)is based on____. reactivity; the number of chemical compounds an element can form
__________ saw the atom as a solid sphere. Dalton
_________ saw the electrons but saw them attached to a solid sphere, but he knew about the______ AND ________ ________ Thompson; positive and negative charges
____________ saw a center and called it a nucleus and saw the movement and orbiting of an atom. Rutherford
____________ saw the protons and neutrons in the center. The electron cloud is caused by movement of the atom. The electron movement causes heat and heat is energy. Bohr
The nucleus is the ______. core
The core contains ____________ ( ) and ___________ ( ) protons; + ; neutrons ; -;
A proton has __________ times the mass of an electron. 2000
Most of the mass of an atom is ___ inside the nucleus
__________ gives atoms a charge. protons and electrons
What is the atomic number? number of protons in the nucleus; every element has a different number of protons, so periodic table is listed by the atomic number
Electrons are not included in the ________ or _____ mass or number
Electrons are not part of the nucleus so… not part of the mass's number
Electrons can be __________, _______, or ________ lost, shared, or transfered
There are over ____ squares on the table. 100
Each square represents __________. one element
Each square includes: atomic number, chemical symbols name, atomic mass
Protons are used as _______. the atomic number because protons never change.
An element's properties can be predicted depending on… where they are on the periodic table
Groups or families are in ________. 18 vertical columns
The group is named by… the first element on the column
Each group reacts _______ with other groups. differently
Group 1 is… metals
Group 1 reacts by doing what with water? violently
Na will ____________ in a bowl of water but NaCl ___________s dissolves nicely
Group 11 reacts __________ with water or not at all slowly
Group 18 ________ react because ___________ are filled does not; their electro levels
The _________ in the valence determines it's bonding. number of electrons
The elements in the same group have ________ number of electrons in the outer levels. the same
Electron levels are lettered from the ____________________. inside out
Levels can hold a ____ number of electrons. certain
K can hold _ electrons. 2
L can hold _ electrons. 8
M can initially hold _ electrons. 8
Elements in the same period have _______ number of electron levels. same
Sodium fluoride prevents cavities
calcium fluoride tooth polish
sodium chloride table salt
Group= family
involved in the transfer or sharing of electrons valence electron

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