chap 6 Flashcards
going down a group of the periodic table what patterns would you notice?
- atomic size increases
- ionic size increases
- ionization enegry decreases
- electronegativity decreases
- nuclear charge increases
- shielding increases
Going across a period what patterns would you notice?
- Atomic size decreases
- ionization energy increases
- electronegativity increases
- nuclear charge increases
- shielding is constant
elements were first classified according to what
their properties
who created the periodic table
Mendeleev
on mendeleevs periodic table how were elements placed
in increasing atomic mass
what did Mendeleev discover thru his table
the properties of unknown elenments
what is the modern day table organized by
atomic number
metals are…
good conductors and many are ductile and malleable
nonmetals are…
mostly gase whose properties are opposite to those of metals
metaloids can…
behave like metals or nonmetals depending on condition
How many elements had been identified by the year 1700?
13
What caused the rate of discovery to increase after 1700?
Chemists began to use scientific methods to search for elements
What did chemists use to sort elements into groups?
Chemists used the properties of elements.
Who was Dmitri Mendeleev?
he created a periodic table
What property did Mendeleev use to organize the elements into a periodic table?
arranged the elements in order of increasing atomic mas
what are 3 things u can name by looking at an element on the periodic table
- atomic number
- atomic mass
- what type of element it is
what is a valence electron
outer edge