chapter 3 science
an 1.)_________ is a form of matter that is composed of a single type of 2.)__________. in 1869, Dmitri 3.)____________ created the 4.)__________ table to group the elements. periodic tables usually show the element name, the element 5.)____________ , and the atomic number.
1.)atom 2.)element 3.)Mendeleev 4.)periodic 5.)symbol
there is a total of..... elements on the table
118
as you go across a row from left to right, the 6.)___________ of the element increases. the atomic number is the same as the number of protons in the nucleus of an atom. as well, elements that have similar 7.)___________ are placed in the same 8.)____________. for example, copper, silver, and 9.)______ all have similar properties and are all placed in column eleven of the periodic table. elements on the left side of the table tend to have properties of 10.)____________ and elements on the right side of the table tend to have properties of 11.)___________. elements in column 18, the last column on the left, are 12.)_________ gasses, which are gases that generally do not react with other elements.
6.)atomic number 7.)properties 8.)column 9.)gold 10.)nonmetals 11.)metals 12.)inert
there are..... natural elements on the table
90
who created the table?
Dmitri mendeleev
the only 2 elements not used on the table are......
J and Q
what element is used in almost all living things?
carbon
what type of science uses the table the most?
chemistry
chemical bond of a nonmetal to a nonmetal is.....
covalent bond
negative charge?
electron
chemical bond of a metal to a nonmetal is....
electrovalent bond
what element is used in toothpaste?
flourine
what element has the shortest life spam?
fransium
what three elements on the table can float on water?
lithium, sodium, and potassium
what element is used in fireworks?
magnesium
most elements on the table are......
matals
neutral charge?
neutron
what elements are not good electrical conductors and are very brittle?
nonmetals
positive charge?
proton
what is inside a nucleus?
protons and neutrons
