Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The numbers of particles in an atom can be calculated from its atomic number and mass number.
Which of Dalton's ideas about atoms is no longer thought to be true?
All matter is made of tiny particles called atoms
The atoms of different elements are different from one another
Atoms cannot be broken down into anything simpler
What makes up the nucleus of most atoms?
Protons and neutrons
Neutrons and electrons
Which of the subatomic particles has a mass of almost zero?
Why are most atoms neutral?
Because they contain no charged particles
Because they have equal numbers of protons and electrons
Because they have more neutrons than protons
How many protons, neutrons and electrons are in an atom which has an atomic number of 11 and a mass number of 23?
11 protons, 12 neutrons, 11 electrons
11 protons, 23 neutrons, 11 electrons
11 protons, 11 neutrons, 12 electrons
What is the atomic number and the mass number of an atom with 29 protons, 36 neutrons and 29 electrons?
Atomic number = 16, Mass number = 36
Atomic number = 29, Mass number = 36
Atomic number = 29, Mass number = 65
What is the name for atoms with the same atomic number but different mass numbers?
Why is the relative atomic mass of chlorine 35.5?
Chlorine contains half a neutron
Chlorine contains half a proton
It is an average mass of the isotopes
Which of these pairs of atoms are isotopes?
Atom A: 13 protons, 12 neutrons and 12 electrons. Atom B: 12 protons, 12 neutrons and 12 electrons
Atom A: 12 protons, 12 neutrons and 12 electrons. Atom B: 12 protons, 12 neutrons and 13 electrons
Atom A: 12 protons, 12 neutrons and 12 electrons. Atom B: 12 protons, 13 neutrons and 12 electrons
Boron naturally exists as two isotopes, boron-10 and boron-11. The abundance of boron-10 is 20% and the abundance of boron-11 is 80%. Using these figures, what is the relative atomic mass of boron? - Higher