LMS Science Homework #14

Which of the following properties uniquely identifies every element?

• Number of valence electrons
• Phase at room temperature
• Number of protons
• Charge of the atom

An elements reactivity and other chemical properties are determined by the number of….

• isotopes it has.
• oxidation states
• orbitals in an atom.
• valence electrons

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Molybdenum has an atomic number of 42. This means that  molybdenum...

• has a freezing point of 42 degrees Fahrenheit.
• belongs to Group 42 on the Periodic Table.
• Can form 42 bonds with other atoms.
• contains 42 protons in its nucleus.

Which is the smallest subatomic particle with the least amount of mass?

• Proton
• Electron
• Neutron

What group of elements are on the "staircase" of the periodic table of elements?

• Metals
• Nonmetals
• Metalloids
• Halogens

Mass number = 

• electrons + protons
• electrons + neutrons
• protons + neutrons
• protons + neutrons + electrons

If an element has two energy levels (orbitals), what period is it in?

• 1
• 2
• 3
• 4

Which subatomic particle(s) is/are found outside the nucleus?

• Protons only
• Electrons only
• Neutrons only
• Protons and Neutrons

An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in the atom?

• 48
• 36
• 84
• -36

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NGSS.MS-PS1-1

• A
• B
• C
• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2