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uestion 20

Which of the following particles cannot be changed without changing the identity of the element?

a
neutron
b
neutrino particle
c
proton
d
electron
Question 21
Atoms of the same element with differing numbers of neutrons are called:

a
compounds
b
elements
c
ions
d
isotopes
Watch the following video on valence electrons and answer the corresponding questions.

Question 22
You can find the number of valence electrons by identifying which period it is in.

True
False
Question 23
How many valence electrons would an element in group 17 on the periodic table have?

a
7
b
this information cannot be found from the information provided
c
17
d
1
Question 24
Match the trend on the periodic table to its description

Column A
1.
a measure of how strongly atoms attract bonding electrons to themselves:
a measure of how strongly atoms attract bonding electrons to themselves
2.
the amount of energy required to remove an electron from an atom or molecule:
the amount of energy required to remove an electron from an atom or molecule
3.
a measure of the size of an atom:
a measure of the size of an atom
Column B
a.electronegativity
b.atomic radius
c.ionization energy
Question 25
Match the type of bond to its description.

Column A
1.
a bond between a metal and a nonmetal:
a bond between a metal and a nonmetal
2.
electrons are transferred:
electrons are transferred
3.
electrons are shared:
electrons are shared
4.
a bond between two nonmetals:
a bond between two nonmetals
5.
NaCl:
NaCl
6.
CO2

:
CO2

7.
highly conductive when dissolved in water:
highly conductive when dissolved in water
8.
not conductive or not very conductive when dissolved in water:
not conductive or not very conductive when dissolved in water
Column B
a.ionic
b.covalent

1 answer

Here are the answers to your questions:

Question 20
Which of the following particles cannot be changed without changing the identity of the element?
Answer: c. proton
Explanation: The number of protons in an atom determines the identity of the element (its atomic number). Changing the number of neutrons (neutrons) or electrons (electrons) does not change the identity of the element.

Question 21
Atoms of the same element with differing numbers of neutrons are called:
Answer: d. isotopes
Explanation: Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Question 22
You can find the number of valence electrons by identifying which period it is in.
Answer: False
Explanation: The number of valence electrons is determined by the group (column) an element is in, not the period (row). For example, elements in group 1 have 1 valence electron, and those in group 17 have 7 valence electrons.

Question 23
How many valence electrons would an element in group 17 on the periodic table have?
Answer: a. 7
Explanation: Elements in group 17, also known as the halogens, have 7 valence electrons.

Question 24
Match the trend on the periodic table to its description:

    1. a measure of how strongly atoms attract bonding electrons to themselves:
      Answer: a. electronegativity
    1. the amount of energy required to remove an electron from an atom or molecule:
      Answer: c. ionization energy
    1. a measure of the size of an atom:
      Answer: b. atomic radius

Question 25
Match the type of bond to its description:

    1. a bond between a metal and a nonmetal:
      Answer: a. ionic
    1. electrons are transferred:
      Answer: a. ionic
    1. electrons are shared:
      Answer: b. covalent
    1. a bond between two nonmetals:
      Answer: b. covalent
    1. NaCl:
      Answer: a. ionic
    1. CO2:
      Answer: b. covalent
    1. highly conductive when dissolved in water:
      Answer: a. ionic
    1. not conductive or not very conductive when dissolved in water:
      Answer: b. covalent

Explanation: Ionic bonds (like NaCl) are formed between metals and nonmetals, involve the transfer of electrons, and typically result in conductive solutions when dissolved in water. Covalent bonds (like CO2) involve the sharing of electrons and usually do not conduct electricity when dissolved in water.