Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Tags

NGSS.HS-PS1-1

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 neutrons

• 40 neutrons

• 22 neutrons

• 21.9 neutrons

Tags

NGSS.MS-PS1-1

Look at this picture of Argon off the periodic table. Which of the following is true for this element when it is neutral?

• 18 electrons

• 40 electrons

• 22 electrons

• 21.9 electrons

Tags

NGSS.HS-PS1-1

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

Tags

NGSS.MS-PS1-1

When you two atoms with different masses, Carbon-12 and Carbon-13 for example, what type of atom do you have?

• Neutral atom

• Ion

• Isotope

Tags

NGSS.HS-PS1-8

When you have an ion of an atom, O^-2 for example, what has changed in the atomic structure?

• Number of protons

• Number of neutrons

• Number of electrons

Tags

NGSS.MS-PS1-1

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

Tags

NGSS.MS-PS1-1

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

NGSS.HS-PS1-8

If X is the symbol for an element, which of the following two symbols represent    isotopes of the same element?     I. ⁷⁷₃₅X  II. ⁷⁷₃₃X  III. ⁸¹₃₇X  IV. ⁸¹₃₅ X

• I and II
• III and IV
• I and IV
• I and III

Tags

NGSS.HS-PS1-8

Four isotopes of lead include lead-204, lead-206, lead-207, and lead-208.  The average atomic mass of lead is 207.2.  Which isotope of lead is likely to be the most abundant.

• 204
• 206
• 207
• 208

Tags

NGSS.MS-PS1-1