Unit 1- History of The Periodic Table

Question 1

how did Mendeleev organize the periodic table? What made him so smart?

Answer 1

he didn’t restrict himself to a repetition pattern of eight
he organized the elements in order of increasing atomic mass

he was a genius because he could predict where new elements would be found

Question 2

what is the modern periodic law and how are the elements in the modern periodic table arranged?

Answer 2

they are arranged in order of increasing atomic number

there is a repetition of elements with similar properties

Question 3

what was one problem with Mendeleev’s way of organizing?

Answer 3

iodine and Tellurium were in the wrong order

Question 4

what are the two organizing principles of the modern periodic table?

Answer 4

in order of increasing atomic number

elements with similar chemical and physical properties we’re grouped

Question 5

why is family a good term to use for the elements in the same column? Name the four most famous families?

Answer 5

they have similar chemical and physical properties

alkali metals alkaline Earth metals halogens noble gases

Question 6

valence versus valence electron

Answer 6

valence is the charge on an atom when it gains loses or shares electrons

valence electrons are electrons in the outer most shell