Unit 2 atomic structure
what is the charge of a proton (+,-, no charge)
+
what is the charge of an electron (+,-,no charge)
-
what is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons
39
compared to the entire atom the nucleus of the atoms is smaller and contains most of the atoms mass T or F
T
an iron atoms has an atomic mass of 56. its atomic number is 26. how many neutrons does the iron atom have? a:30 b: 26 c: 56 d: 82
a
the atomic mass of an element is defined as the weighted average mass of the elements a: naturally occurring isotopes b: least abundant isotopes c: radioactive isotopes d: most abundant isotope
a
what is the atoms nucleus made of a: protons and neutrons b: only protons c: only neutrons d: anodes
a
A subatomic particle that has a negative charge is called a a: molecule b: electron c: element d: compound
b
An atom's mass number equals the number of a:protons plus the number of electrons b:protons plus the number of neutrons c:protons d:neutrons
b
an elements atomic number is equal to its number of a: neutrons b: protons c: valence electrons d: protons and neutrons
b
when you change the number of electrons in an atom, you produce a different a:isotope b: ion c: type of atom d: mass number
b
which of the following statements is not consistant with current atomic theory? a: all matter is made of atoms b: the atoms of the same element are identical c: atoms are mostly empty space d: atoms are identified as elements by the number of protons they contain
b
Physical or chemical change a fish that is left for some time in an unrefrigerated place decomposes
c
Physical or chemical change a loaf of bread rises and its volume expands when it is baked in an oven
c
Physical or chemical change when sugar is fermented under certain conditions, alcohol is produce
c
Which statements about an element's average atomic mass is correct? a: it is determined by counting the number of isotopes is a sample of the element b: it is equal to one-twelth the mass of the most common isotopes c:it is weighted average, so common isotopes have a greater effect then uncommon ones d:it is based on an isotopes charge, so negative charged isotopes have a greater effect then positive ones
c
all atoms of an element have the same a:neutrons b: atomic mass c: atomic number d: mass number
c
atoms have no electric charge because they a: have an equal number of charged and non-charged particles b: have neutrons in the nuclei c: have an equal number of electrons and protons d: have an equal number of neutrons and protons
c
which sub atomic particles have approximately the same size and mass? a: protons and electrons b: electrons and neutrons c: protons and neutrons d: protons and positrons
c
Oxygen's atomic number is 8. This means that an oxygen atom has: a: eight neutrons in its nucleus b:a total of eight protons and neutrons c: eight protons in its nucleus d: a total of eight neutrons and electrons
eight protons in its nucleus (c)
what is the charge of a neutron (+,-,no charge)
no charge
Physical or chemical change baking soda bubbles when it is added to vinegar and carbon dioxide gas is released
p
Physical or chemical change liquid nitrogen bubbles as it boils
p
Physical or chemical change water bubbles as it goes over a waterfall
p
Physical or chemical change a halogen light glows with a purple color
p
Physical or chemical change when a lake starts to freeze in winter, ice is formed on the surface
p
