Chemistry: Atoms, Elements, and Protons

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What defines an element?

The number of subshells in an electron cloud

The number of neutrons in an atom

The number of protons in an atom (correct)

The number of electrons in an atom

What is the charge of a proton?

Neutral

Negatively charged

Variable

Positively charged (correct)

What is the function of electrons in an atom?

To create the nucleus

To orbit the protons

To participate in chemical reactions (correct)

To create bonds with neutrons

What is the arrangement of electrons in an atom?

In a electron cloud with specific subshells (B) Signup and view all the answers

What is the relationship between energy levels and distance from the nucleus?

The farther from the nucleus, the higher the energy level (B) Signup and view all the answers

What is the number of possible energy levels around the nucleus?

7 (C) Signup and view all the answers

What is the state of an electron that has returned to its lowest energy level?

Ground state (C) Signup and view all the answers

What determines the number of valence electrons in an atom?

Group number (B) Signup and view all the answers

What is the term for the number of protons in the nucleus of an atom?

Atomic number (C) Signup and view all the answers

What is the difference between isotopes of the same element?

Different number of neutrons (C) Signup and view all the answers

What is the average mass of all the isotopes of a particular element?

Atomic mass (B) Signup and view all the answers

Why do atoms strive to have a full valence shell of 8 electrons?

To become a Noble Gas (B) Signup and view all the answers

What is the atomic mass of an element based on?

The weighted average of the naturally occurring isotopes of the element (B) Signup and view all the answers

What is the basis of the modern periodic table?

The number of protons in the nucleus (C) Signup and view all the answers

What is the main difference between a molecule and a compound?

The number of different elements in the molecule (B) Signup and view all the answers

What is the main organizational feature of the periodic table?

Horizontal rows called periods and vertical columns called groups (D) Signup and view all the answers

What is the definition of matter?

Anything that has mass and occupies space (D) Signup and view all the answers

What is the characteristic of a metalloid?

It exhibits some properties of metals and some properties of nonmetals (A) Signup and view all the answers

What is the Law of Triads?

A method of organizing elements based on their similarity in every third element (B) Signup and view all the answers

What is the characteristic of a compound?

It is a pure substance formed by the chemical combination of at least two different elements (C) Signup and view all the answers