BSC 2010-STEVEN MARKS EXAM 1 |LATEST
UPDATED 2026/2027 |A COMPLETE SOLUTION
WITH VERIFIED QUESTIONS AND ANSWERS |GET IT
100% CORRECT |GRADED A+
Which of the following lists some of the levels of biological organization
from less complex to more complex?
atoms, molecules, cells, organs
The innermost electron shell of an atom can hold up to _____ electrons.
2
What relationship is true of an uncharged atom?
The number of protons is equal to the number of electrons.
What determines the types of chemical reactions that an atom
participates in?
the number of electrons in the outermost shell
What is the atomic number of an atom that has 6 protons, 6 neutrons,
and 6 electrons?
6
What refers to atoms with the same atomic number but different atomic
masses?
isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many
neutrons does fluorine have?
10
,An uncharged atom of boron has an atomic number of 5 and an atomic
mass of 11. How many protons does boron have?
5
What is the mass number of an ion with 109 electrons, 159 neutrons, and
a +1 charge?
269
Which of the following subatomic particles always has a positive charge?
proton
Changing the number of __________ would change an atom into an atom
of a different element.
protons in an atom
Compared with 31P, the radioactive isotope 32P has
one more neutron
We can represent atoms by listing the number of protons, neutrons, and
electrons−−for example, 2p+,2n0,2e− for helium. Which of the following
represents the 18O isotope of oxygen?
8p+,10n0, 8e-
An ion with six protons, seven neutrons, and a charge of 2+ has an atomic
number of ________.
6
which of the following atoms has the smallest number of neutrons?
a. nitrogen-14
b. oxygen-16
c. carbon-14
d.neon-20
a. nitrogen-14
,The atomic number of nitrogen is 7. Which of the following explains the
greater mass number of nitrogen-15 compared to nitrogen-14? Nitrogen-
15 contains ________.
8 neutrons and nitrogen-14 contains 7 neutrons
To find out the number of neutrons in an atom, we need to know...
mass and atomic number
Based on electron configuration, which of the elements would exhibit a
chemical behavior similar to oxygen?
a. nitrogen
b. phosphorus
c. carbon
d. sulfur
d. sulfur
which subatomic particle(s) have a mass of ~1amu?
proton and neutron
which subatomic particle(s) have a mass of ~1/2000amu?
electron
A(n) _____ refers to two or more atoms held together by covalent bonds
molecule
The type of bonding and the number of covalent bonds an atom can form
with other atoms is determined by __________.
the number of unpaired electrons in the valence shell
An ionic bond is formed when _____.
one atom transfers an electron to another atom
Which statement is true of all atoms that are anions?
The atom has more electrons than protons.
, A covalent bond is likely to be polar under which of the following
conditions?
one of the atoms sharing electrons is more electronegative than the other
atom
A phrase that applies to covalent bonding and not other kinds of bonds is
...
electron-sharing.
What happens when two atoms form a chemical bond?
A chemical bond forms when two atoms transfer or share outer electrons
to complete their outer shells.
Chemical equilibrium is reached when _____.
the forward and reverse reactions occur at the same rate so that the
concentrations of reactants and products remain the same
What coefficients must be placed in the following blanks so that all atoms
are accounted for in the products?
C6H12O6→_____C2H6O+_____CO2
2:2
larger concepts are____________________________ smaller concepts.
distinct from but also dependent on
True or false: Everything in biology is a chemical reaction
true
What 4 elements make up 96% of living matter?
carbon, hydrogen, oxygen, nitrogen
What two elements are structurally important?
calcium, phosphorus
How many electrons can each orbital hold?
UPDATED 2026/2027 |A COMPLETE SOLUTION
WITH VERIFIED QUESTIONS AND ANSWERS |GET IT
100% CORRECT |GRADED A+
Which of the following lists some of the levels of biological organization
from less complex to more complex?
atoms, molecules, cells, organs
The innermost electron shell of an atom can hold up to _____ electrons.
2
What relationship is true of an uncharged atom?
The number of protons is equal to the number of electrons.
What determines the types of chemical reactions that an atom
participates in?
the number of electrons in the outermost shell
What is the atomic number of an atom that has 6 protons, 6 neutrons,
and 6 electrons?
6
What refers to atoms with the same atomic number but different atomic
masses?
isotopes
Fluorine's atomic number is 9 and its atomic mass is 19. How many
neutrons does fluorine have?
10
,An uncharged atom of boron has an atomic number of 5 and an atomic
mass of 11. How many protons does boron have?
5
What is the mass number of an ion with 109 electrons, 159 neutrons, and
a +1 charge?
269
Which of the following subatomic particles always has a positive charge?
proton
Changing the number of __________ would change an atom into an atom
of a different element.
protons in an atom
Compared with 31P, the radioactive isotope 32P has
one more neutron
We can represent atoms by listing the number of protons, neutrons, and
electrons−−for example, 2p+,2n0,2e− for helium. Which of the following
represents the 18O isotope of oxygen?
8p+,10n0, 8e-
An ion with six protons, seven neutrons, and a charge of 2+ has an atomic
number of ________.
6
which of the following atoms has the smallest number of neutrons?
a. nitrogen-14
b. oxygen-16
c. carbon-14
d.neon-20
a. nitrogen-14
,The atomic number of nitrogen is 7. Which of the following explains the
greater mass number of nitrogen-15 compared to nitrogen-14? Nitrogen-
15 contains ________.
8 neutrons and nitrogen-14 contains 7 neutrons
To find out the number of neutrons in an atom, we need to know...
mass and atomic number
Based on electron configuration, which of the elements would exhibit a
chemical behavior similar to oxygen?
a. nitrogen
b. phosphorus
c. carbon
d. sulfur
d. sulfur
which subatomic particle(s) have a mass of ~1amu?
proton and neutron
which subatomic particle(s) have a mass of ~1/2000amu?
electron
A(n) _____ refers to two or more atoms held together by covalent bonds
molecule
The type of bonding and the number of covalent bonds an atom can form
with other atoms is determined by __________.
the number of unpaired electrons in the valence shell
An ionic bond is formed when _____.
one atom transfers an electron to another atom
Which statement is true of all atoms that are anions?
The atom has more electrons than protons.
, A covalent bond is likely to be polar under which of the following
conditions?
one of the atoms sharing electrons is more electronegative than the other
atom
A phrase that applies to covalent bonding and not other kinds of bonds is
...
electron-sharing.
What happens when two atoms form a chemical bond?
A chemical bond forms when two atoms transfer or share outer electrons
to complete their outer shells.
Chemical equilibrium is reached when _____.
the forward and reverse reactions occur at the same rate so that the
concentrations of reactants and products remain the same
What coefficients must be placed in the following blanks so that all atoms
are accounted for in the products?
C6H12O6→_____C2H6O+_____CO2
2:2
larger concepts are____________________________ smaller concepts.
distinct from but also dependent on
True or false: Everything in biology is a chemical reaction
true
What 4 elements make up 96% of living matter?
carbon, hydrogen, oxygen, nitrogen
What two elements are structurally important?
calcium, phosphorus
How many electrons can each orbital hold?
