chapter 6 and 7 Flashcards
what is the significance of the staircase on the periodic table?
separate the metals and non metals
who designed the earliest periodic table?
dmitri mendeleeve
what is an element
pure substance that can’t be broken down into a simpler chemical substance
what is a compound
two or more elements chemically joined
what is a period
a horizontal row showing increasing and decreasing reactive rows
what is a group
elements in the same family
what is a metal
can visually see it, can have colours, odour, or taste
what is a non metal
tasteless, colourless, odourless
what is an atomic number
number of protons in a nucleus
what is mass
weighted average of the isotopes of that element
what is a proton
positively charged particle in the nucleus
what is a neutron
particle in the nucleus with no charge
what is an electron
a negatively charged particle in the nucleus
similarities and differences between the bohr diagram and plum pudding model
similarities - both have electrons and protons around the nucleus
differences - plum pudding has small negative particles emitted by hot materials and bohr has a rainbow passing thru a prism
what are the maximum number of electrons that can be found in the first three orbits
2, 8, 8
what is similar between the atomic theory and students working together
newer developers have added and made corrections to the atomic theory, students do that with their school work
what does the term diatomic mean
when there are two of the same element
what are the 7 diatomic elements
H2, N2, O2, F2, Cl2, Br2, I2
what does ionic bond mean
when a non metal and metal combine
what does a molecular element mean
when two of the same non metals combine
what does an alloy mean
when a metal and metal combine
what is the difference between a molecular element and molecular compound
a molecular compound is are molecules containing more than one element and a molecular element is two of the same elements
how do ionic compounds form
when a positive and negative charged particle combine (cation and anion)
which elements combine to form molecules
non metals
