Chemistry

What is the electron configuration of He?

• 1s²

• [He]2s²

• [He]2s²

• [He]2s²2p¹

What is the electron configuration of sodium?

•  [He]2s²2p⁵

• [Ne]3s¹

• [He]2s²2p⁶

•  [Ne]3s²

What element has the electron configuration: 1s^2 2s^2 2p^6 3s^2 3p^5

• Sulfur

• Fluorine

• Argon

• Chlorine

What does the # of protons always equal what if the element is neutral?

• electrons

• atomic number

• neutrons

Calculate the average amotic mass: 90.92% abundance with 19.99 amu, 0.26% abundance with 20.99 amu.

• 99.19

• 1.16

• 18.39

• 18.23

What part of the atom contains the most mass?

• Electrons

• Nucleus

What are the four sublevels in order

• s,p,f,d

• f,d,p,s

• s,p,d,f

• p,s,d,f

Are isotopes atoms that have the same atomic numbers but different mass number

• True

• Flase

There are 6 orbitals in the p subshell

• False

• True

As wavelength increases, what happens to the frequency?

• doubles

• increases

• stays the same

• decreases