Periodic Table Flashcards
What nickname was given to the model of the atom proposed by john dalton?
Billiard ball model
Which scientists model was the first to introduce the idea of electrons
Thomson
The solar system model of the atom was developed by…?
Thomson
The idea that an atom has a dense positive nucleus was proposed by..?
Rutherford
According to the current model of the atom electrons exits where?
In orbitals
The atomic mass of an element indicates the?
Sum of protons plus neutrons
The atomic number of magnesium is 12. It nucleus most contain?
a. 6 protons and 6 neutrons
b. 12 protons and no electrons
c. 6 neutrons and no neutrons
b. 12 protons and no electrons
The elements in the periodic table are arranged by?
Atomic number
Horizontal rows of elements in the periodic table are called?
Periods
Vertical columns of elements in the periodic table are called?
Groups
Isotopes of the same element may differ in their number of?
Neutrons
An ion of a certain atom has a different number of..?
Electrons then usual
The periodic table was designed by who?
Mendeleev
Properties of metals
Shiny
Good conductors
Metalloids are located where on the periodic table?
On the right after the metals
Examples of physical changes
Melting, boiling, freezing,
Examples of chemical changes
Water evaporating
Indicators of a chemical change?
Changes the kinds of molecules present
Difficult to reverse
An element has more electrons than protons. True or false?
False! An element has the same amount of electrons and protons
Isotopes of the same element have different atomic numbers. True or false
False! isotopes of the same element have a different amount of electrons
Atomic symbols are the same in each country and language. True or false
True!!!
There are four elements! Fire, earth, water, air. True or false
False
All elements have been found. True or false?
False there are still many unfound elements
A proton is heavier than an electron. True or false?
True a proton is much heavier
A group of atoms with the same amount of protons but different amount of neutrons is called?
An isotope
An atom with a different number of electrons is called?
An ion
If there are extra electrons it will be….
a. Negative
b. positive
a. Negative
If there are missing electrons it will be? a. Negative
b. Positive
b. positive
