ACA Unit 1 Atomic Structure & Nuclear Chemistry

Atomic mass =

• protons + electrons

• protons + neutrons

• neutrons - electrons

• protons - electrons

Which of the following is true for a neutral atom?

• neutrons = protons

• protons = electrons

• protons > electrons

• protons < electrons

Tags

NGSS.HS-PS1-7

How many protons does the element Ti have?

• 47.87

• 22

• 48

• 26

Tags

NGSS.MS-PS1-1

What is the number of protons in Nitrogen?

• 14
• 7
• 15
• 18

Tags

NGSS.HS-PS1-1

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

How do Carbon-12 and Carbon-14 differ?

• Different atomic number

• Different atomic mass

• Different elements

• Different ages

Tags

NGSS.HS-PS1-8

7.4% of all lithium has an atomic mass of 6 (lithium-6).  92.6% of all lithium is lithium-7.  Calculate the average atomic mass.

• 5.98 am

• 6.87 amu

• 6.93 amu

• 7.05 amu

75.89% of all chlorine has a mass of 35.  24.11% of all chlorine has a mass of 37.  Calculate the average atomic mass.

• 19.040 amu

• 1850 amu

• 42.02 amu

• 35.48 amu

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Oxygen has multiple isotopes, including O-14, O-16, and O-18. The average atomic mass for oxygen is 16 amu. Without doing any calculation, predict which isotopes is most abundant.

• O-14

• O-16

• O-18

Over time, different scientists made discoveries about the structure of an atom. Which of the following statements is true?

• The atom is mostly empty space with a dense, positive nucleus.

• The nucleus has negative charge

• There is no pattern to how electrons orbit the nucleus.

• Atoms of the same element all have the same mass.

Tags

NGSS.HS-PS1-8