Bio Ch 2.1 Practice Review

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For a neutral (uncharged) element, the number of electrons is equal to the -----?
Number of protons
How many protons are in an atom Sr-86?
38
How many neutrons are in an atom of Sr-86?
86-38 = 48
How many electrons are in an (uncharged) atom of Sr-86?
38
Fe
Iron
How many protons does Iron have?
26
What is Iron's mass number?
56
What is Iron's atomic mass?
55.845
How many electrons does Iron have?
26
How many neutrons does Fe-56 have?
56-26 = 30
Fe +1 means
Iron lost an electron
Fe -2 means
Iron gained two electrons
If Fe gains electrons it is called a(n)
Ion
H2O is held together by _________ bonds
covalent
NaCl is held together by ________ bonds
ionic
Which bond (ionic/covalent) is stronger?
covalent
Where are protons located?
nucleus
Where are electrons located?
electron cloud outside the nucleus
What charge does a neutron have?
neutral
What charge does a proton have?
positive
What subatomic particle determines the element
proton
How many electrons does an element want to have in the outer level
8