Chapter 1-EL1 + EL2 Elements Flashcards
Atomic structure
Where is most of the mass of an atom concentrated?
The nucleus
What is the diameter of the atomic nucleus compared to the atom as a whole?
Small
What is the relative charge of a proton?
-1
What is the relative size of a proton?
1
What is the relative size of a electron?
1/2000
What is the symbol for mass number?
A
What is the relative charge for an electron?
-1
What is the relative charge of a neutron?
0
What is the relative size of a nuetron?
1
What is the symbol for atomic number?
Z
What is the mass number of an element?
The number of protons plus neutrons inside of an atoms nucleus
What is the atomic number on an element?
The number of protons in an atom
Which number is the atomic number in the periodic table?
The bottom one
Which number is the mass number in the periodic table?
The top one
What is an Isotope?
Atoms of the same element containing different mass numbers, different number of neutrons
What two types of particles are in the nucleus?
Protons and neutrons
What do all elements have in common?
Same atomic number
Why do isotopes have the same reactivity and chemical properties?
They have the same configuration of electrons
D
How do most elements exist naturally?
As a mixture of isotopes
What is relative atomic mass an average of?
Relative isotopic mass, taking isotopic abundance into account
What determines the chemical properties of an element?
The number and arrangement of electrons
What often determines the physical properties of an element
What takes up the most space in atom?
Electrons in their shells
What is the process in stars to generate energy and form heavier elements?
Nuclear fusion
What conditions are required
