ChemChapter4and7

a collection of atoms of one type that cannot be broken down into simpler substances by ordinary chemical or physical means

• element

• subatomic particle

• electron

• matter

Periodic law states that the elements are arranged according to their atomic ________ so that elements with similar chemical properties are in the same ________ and properties repeat periodically.

• numbers, rows

• masses, rows

• masses, column

• numbers, column

Why were there blank spaces left in Mendeleev's periodic table?                                              

• He didn't know what to put there.
•  Undiscovered elements not yet known.
• Multiple elements could have fit
• He forgot to add the elements in.

Used the law of triads to make a list of elements

• Mendeleev
• Dobereiner
• Mosely

Who arranged the periodic table by increasing atomic number?

• Mendeleev
• Rutherford
• Bohr
• Mosely

In a chemical "triad", the masses of the three elements were related by the fact that

• the masses of the three were all the same

• their masses added up to 100%

• the average of the masses of the outer two equaled the middle one

• their masses were all unknown

Who discovered a way to measure atomic number?

• John Newland

• Johann Dobereiner

• Henry Moseley

• Antoine Lavoisier

Which statement is not a difference between Mendeleev's table and the modern periodic table?

• there are no transition elements Mendeleev's table.
• Elements are arranged according to atomic no. not atomic mass.
• no gaps in the modern periodic table.
• much more than 60 elements in the modern periodic table.

The "Law of Octaves" stated that

• The properties of the elements repeated every eighth element when arranged by their atomic mass

• Elements could be classified in groups of three based on their mass and properties

• The properties of the elements repeated of a regular basis when arranged by their atomic number

• doubling the frequency of a tone raises its pitch by an octave

As atoms of elements in group 16 are considered in order from top to bottom, the electronegativity of each successive element....

• decreases
• increases
• remains the same
• none of the above