Physical Science Chapter 17( Elements and the Periodic Table)

The precursor of chemistry, known as________ was a mixture of mysticism, magic, and genuine science.

Alchemy

Mendeleev arranged the elements of his periodic table in order of increasing________?

Atomic mass

Henry Moseley's work led to Medeleev's periodic table being arranged according to_______.

Atomic number

Why are noble gases very stable and reluctant to bond with other elements?

Because of thier (number of) valence electrons

Modern___________ are based on one or two letters from the element's name.

Chemical symbols

Neutral, unbounded elements in the same______ of the periodic table all have the same number of valence electrons.

Column

A________ element consists of a_______ made of two identical atoms.

Diatomic; molecule

Robert Boyle defined a______ as a substance that could not be broken down into simpler substances.

Element

(True or false) Elements in the same period have similar properties.

False

(True or false) Nonmetals all have similar physical and chemical properties.

False

(True or false) Since Moseley's time, the periodic table has changed very little.

False

All early attempts to organize the elements revealed that element properties seemed to repeat at regular intervals. What is this principle called?

Periodicity

(True or false) By breaking water down into hydrogen and oxygen, Lavoisier demonstrated that the classical element model had serious workability problems.

True

(True or false) The majority of elements are metals.

True

What did the blank spaces in Medeleev's periodic table represent?

Undiscovered elements

Metals conduct electricity and heat well, because they have loosely bound__________.

Valence electrons