BIOLOGY 1201 EXAM 1 QUESTIONS AND
ANSWERS 2026 VERIFIED.
About 25 of the 92 natural elements are known to be essential to life. Which four of these 25
elements make up approximately 96% of living matter? - ANS Carbon, Hydrogen, Nitrogen,
Oxygen
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? -
ANS 6
Which of these refers to atoms with the same atomic number but different atomic masses? -
ANS Isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine
have? - ANS 10
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
protons does boron have? - ANS 5
Atoms with the same number of protons but with different electrical charges _____. -
ANS Are different ions
In salt, what is the nature of the bond between sodium and chlorine? - ANS Ionic
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, What is the result of the animated process?
A bond between Na and Cl form where one electron from Na transfers to Cl - ANS a positively
charged sodium ion and a negatively charged chlorine ion
An ionic bond involves _____. - ANS an attraction between ions of opposite charge
What type of bond is joining the two hydrogen atoms? - ANS Covalent
A(n) _____ refers to two or more atoms held together by covalent bonds. - ANS molecule
This atom can form up to _____ single covalent bond(s).
Atom with 4 valence electrons - ANS 4
A(n) _____ bond joins these two oxygen atoms. - ANS A double covalent bond
The brackets are indicating a(n) _____ bond. - ANS hydrogen bond
What name is given to the bond between water molecules? - ANS hydrogen
Which of these figures correctly illustrates the nature of the bonding of H2O? - ANS
What type of bond joins the carbon atom to each of the hydrogen atoms? - ANS Single
(nonpolar) covalent
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ANSWERS 2026 VERIFIED.
About 25 of the 92 natural elements are known to be essential to life. Which four of these 25
elements make up approximately 96% of living matter? - ANS Carbon, Hydrogen, Nitrogen,
Oxygen
What is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons? -
ANS 6
Which of these refers to atoms with the same atomic number but different atomic masses? -
ANS Isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine
have? - ANS 10
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. How many
protons does boron have? - ANS 5
Atoms with the same number of protons but with different electrical charges _____. -
ANS Are different ions
In salt, what is the nature of the bond between sodium and chlorine? - ANS Ionic
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 13
, What is the result of the animated process?
A bond between Na and Cl form where one electron from Na transfers to Cl - ANS a positively
charged sodium ion and a negatively charged chlorine ion
An ionic bond involves _____. - ANS an attraction between ions of opposite charge
What type of bond is joining the two hydrogen atoms? - ANS Covalent
A(n) _____ refers to two or more atoms held together by covalent bonds. - ANS molecule
This atom can form up to _____ single covalent bond(s).
Atom with 4 valence electrons - ANS 4
A(n) _____ bond joins these two oxygen atoms. - ANS A double covalent bond
The brackets are indicating a(n) _____ bond. - ANS hydrogen bond
What name is given to the bond between water molecules? - ANS hydrogen
Which of these figures correctly illustrates the nature of the bonding of H2O? - ANS
What type of bond joins the carbon atom to each of the hydrogen atoms? - ANS Single
(nonpolar) covalent
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 13
