periodic table :) Flashcards
(23 cards)
What is a mixture?
Two or more substances mixed together
What is a compound?
A thing made up of two or more substances.
What is the charge of a nucleus?
Positive
What is a nucleus of an element made up of?
Protons and neutrons
What is a charge of a Proton?
Positive
What is a charge of a neutron?
Neutral
What is a charge of an electron?
Negative
What is an ion?
When an electron is lost or gained
What is an isotope?
When two elements have the same number of protons but different number of neutrons.
What is the equation for Relative Atomic Mass?
(mass number x %) + (mass number x %) /100
What is the equation for Weighted Average? (two isotopes)
(mass x number) + (mass x number) / total number
Name 3 properties of Noble gases
Colorless, odorless and unreactive
Why are noble gases unreactive?
Because they have a full outer shell.
Name the Halogens from most reactive to least reactive.
Fluorine, Chlorine, Bromine, Iodine
What’s the difference between the plum pudding model and nuclear model?
The plum pudding model had negatively-charged electrons embedded within a positively-charged. The nuclear model of the atom consists of a small and dense positively charged interior surrounded by a cloud of electrons.
What is an atom?
Atoms are the smallest unit of basic building blocks of ordinary matter.
Is the atomic number at the bottom or the top of an element?
Bottom.
Is the mass number at the top or the bottom of the element?
Top.
How do you find the number of protons of an element?
Atomic number = number of protons
How do you figure out the number of electrons?
Atomic number = number of electrons
How do you figure out the number of neutrons of an element.
Mass number - atomic number.
What is the overall charge of an atom?
0/neutral
How has the atomic model changed over time by James Chadwick?
James Chadwick had the atomic theory has been further enhanced by the concept that protons and neutrons are made of even smaller units called quarks.
