Atomic structure and isotopes - 2.1 - (2) Flashcards
Page 9 & 10
Every atom…
of an element has the same number of protons
How many protons does the atom of nitrogen, atomic number 7, contain?
contains 7 protons
How many protons does the atom of oxygen, atomic number 8, contain?
contains 8 protons
Unlike protons, the number of neutrons in the atoms of an…
element can be different, usually within a narrow range
What are isotopes?
isotopes are atoms of the same element with different number of neutrons and different masses
What is the symbol for the mass number?
A (which stands for the nucleon number)
What does A stand for?
number of protons + number of neutrons
What is the symbol for the atomic number?
Z (which stands for the proton number)
What does Z stand for?
number of protons
Chemical reactions involve the electrons…
surrounding the nucleus
What do different isotopes of the same element have?
the same number of electrons
What has no effect on reactions of an element?
the number of neutrons
What will react in the same way?
different isotopes of an element
What may have small differences?
the physical properties of the isotopes
What are the actual differences in the physical properties with higher-mass isotopes?
higher melting point, boiling point, and denisty - but the chemical reactions are the same
