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14 Answer:

_____ is the most abundant element in the Earth's atmosphere.

15 Answer:

The _____ electrons are those found in the outermost energy level of

an atom.

16 Answer:

In the modern periodic table, elements are arranged in order of

increasing atomic masses.

a. true

b. false

17 Answer:

Elements can be classified as metals, nonmetals, or metalloids.

a. true

b. false

18 Answer:

Nonmetals are good conductors of heat and electricity.

a. true

b. false

19 Answer:

Luster is a chemical property of metals.

a. true

b. false

20 Answer:

Halogens include fluorine, chlorine, bromine, iodine, and astatine.

a. true

b. false

Sagot :

adioabiola

Oxygen is the most abundant element in the Earth's atmosphere.

The valence electrons are those found in the outermost energy level of an atom.

In the modern periodic table, elements are arranged in order of increasing atomic numbers. True

Elements can be classified as metals, nonmetals or metalloids. True

Nonmetals are good conductors of heat and electricity. False

Luster is a chemical property of metals. True

Halogens include fluorine, chlorine, bromine, iodine, and astatine. True

What is an element?

An element is a substance which cannot be split into simpler units by a ordinary chemical process

So therefore, Oxygen is the most abundant element in the Earth's atmosphere.

  • The valence electrons are those found in the outermost energy level of an atom.
  • In the modern periodic table, elements are arranged in order of their increasing atomic numbers True

Learn more about elements:

https://brainly.com/question/11252068

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