Combined Foundation Flashcards
What is an atom?
Smallest part of an element that can exist
What is Dalton’s model of the atom?
a) A dense nucleus with electrons orbitting in shells?
b) a solid sphere that cannot be divided?
c) a sphere of positive charge with electrons embedded?
b) Atoms are solid spheres that cannot be divided into smaller parts
What is the plum pudding model of the atom?
a) A dense nucleus with electrons orbitting in shells?
b) a solid sphere that cannot be divided?
c) a sphere of positive charge with electrons embedded?
c) Sphere of positive charge with negative electrons embedded init
What did scientists discover in the alpha scattering experiment?
a) a small centre with mass?
b) the neutron?
c) electron shells?
a) Some atoms were deflected by the gold foil - this showed that an atoms mass and positive charge must be concentrated in the centre - the nucleus
Describe the nuclear model of the atom?
a) A dense nucleus with electrons orbitting in shells?
b) a solid sphere that cannot be divided?
c) a sphere of positive charge with electrons embedded?
a) dense nucleus with electrons orbiting it
What did Neils Bohr discover?
a) a small centre with mass?
b) the neutron?
c) electron shells?
c) electrons orbit in fixed energy shells
What did James Chadwick discover?
a) a small centre with mass?
b) the neutron?
c) electron shells?
b) Uncharged particle called a neutron
Where are protons and neutrons found?
a) in the nucleus
b) in energy shells?
a) in the nucleus
What is the relative mass of a proton, neutron and electron?
Proton = 1
Neutron =1
Electron = 0 (very small)
What is the relative charge of a proton, neutron and electron?
Proton = +1
Neutron = 0 (no charge)
Electron = -1
How can you find out the number of protons in an atom?
a) the atomic number?
b) the mass number?
c) the mass number - the atomic number?
a) The atomic number (smaller number on the periodic table)
How can you calculate the number of neutrons in an atom?
a) the atomic number?
b) the mass number?
c) the mass number - the atomic number?
c) mass number - atomic number
Why do atoms have no overall charge?
They have equal numbers of positive protons and negative electrons
How many electrons would you place in the first, second and third shells?
up to 2 in the 1st shell
up to 8 in the 2nd shell
up to 8 in the 3rd shell
What is an element?
a) a substance made of two or more different elements chemically bonded?
b) a substances made from only one type of atom?
c) a substance made of two or more different elements or compounds NOT chemically bonded?
b) Substance made up of only one type of atom
