Chemistry Chapter 2 Quiz

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Questions and Answers

What is the mass number of the atom if there are 6 neutrons and 6 protons?

  • 7
  • 5
  • 17
  • 12 (correct)

The nucleus of an atom contains protons and electrons.

False (B)

What are the particles labeled P, Q, and R in an atom?

P: Neutrons, Q: Protons, R: Electrons

The part of the atom labelled S is the ______.

<p>Nucleus</p> Signup and view all the answers

Match the following particles with their charges:

<p>Proton = Positive charge Neutron = No charge Electron = Negative charge</p> Signup and view all the answers

Which metal is represented by the symbol Na in Period 3?

<p>Sodium (C)</p> Signup and view all the answers

Elements in Group 0 are highly reactive due to their need to gain electrons.

<p>False (B)</p> Signup and view all the answers

What is the electronic configuration of an atom of nitrogen?

<p>2.5</p> Signup and view all the answers

The boiling point of helium is ______ °C.

<p>-269</p> Signup and view all the answers

Match the Group 0 elements with their boiling points:

<p>Helium = -269 °C Neon = -246 °C Argon = -186 °C Krypton = -153 °C</p> Signup and view all the answers

Flashcards

Atom's Parts

Atoms are made up of protons, neutrons, and electrons.

Atomic Nucleus

The central part of an atom, containing protons and neutrons.

Mass Number of an Atom

The total number of protons and neutrons in an atom's nucleus.

Identifying an Element (mass number)

To identify an element, use atomic mass (sum of Protons + neutrons).

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Identifying Carbon Atom

Element with atomic number 6 (6 protons).

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Metallic element in Period 3

An element in the third row of the periodic table that has metallic properties.

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Group 0 elements

Elements in the last column of the periodic table, characterized by unreactivity.

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Relative atomic mass and boiling point

The relationship between the mass of an atom and the point at which a liquid turns into a gas (boiling).

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Unreactive elements in Group 0

These elements are unreactive due to their filled outermost electron shells (valence electrons)

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Reactivity of Halogens

Halogens' reactivity decreases down the group as atoms get bigger, reducing attraction with electrons.

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