Electrons configuration

Which element has electronic configuration of 1s2 2s2 2p6 3s2 3p2

• C

• Si

• Mg

• Be

Tags

NGSS.HS-PS1-1

Which atom has electron electron configuration of 1s2 2s2 2p6 after gaining 1 more electron to achieve octet stability.

• F

• Ne

• Ar

• Kr

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Whta is the electronic configuration for V atom?

• [Ar] 4s2 4d2

• [Ar] 4s2 3d2

• [Ar] 4s2 4d3

• [Ar] 4s2 3d3

Tags

NGSS.HS-PS1-1

Why there is a sudden jump for the third ionisation energy for Be atom?

• Proton number is increasing

• Distance of electron is getting further away from the nucleus

• Electron removed is getting closer to the nucleus

• Shielding effect from the inner electron shells/orbital

Tags

NGSS.HS-PS1-2

The valence electron for Li atom is located at which orbital?

• 1s

• 2s

• 2p

• 2d

Tags

NGSS.HS-PS1-1

Why Sulfur has a lower first ionisation energy than Phosphorus?

• Sulfur outermost electron is more shielded than Phosphorus

• the atomic size is bigger

• due to spin - pair repulsion

• Sulfur has more electron than Phosphorus

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why the third ionisation energy for Calcium shows a sudden energy jump compare to the second ionisation energy?

• the third electron is smaller than the second electron

• the third electron is closer to the nucleus

• the third electron is more shielded than the second electron

• the electron is removed from p orbital

The valence electron for K atom is located at ___ orbital.

Choose one answer to fill in the blank

• 2s

• 2p

• 3s

• 3p

Tags

NGSS.HS-PS1-1

After 3p orbital has been filled with electron, why the electron is added to the 4s orbital instead of 3d orbital?

• difference in shape of orbital

• the first ionisation is increasing across the period

• the first ionisation is decreasing going down the group

• due to orbital energy level

Ion B has 10 electrons. It has a charge of (3+).

What is atom B?

• nitrogen

• neon

• aluminium

• sodium

Tags

NGSS.HS-PS1-1