# Chemistry

how do i write the complete electron configuration for Ga3+ and Mg2+????????????

1. 👍 1
2. 👎 5
3. 👁 9,510
1. Ga3+
The atomic number of neutral Ga is 31. Atomic number is equal to the number of electrons if the atom is neutral. Since it has a charge of 3+, it means it lost 3 electrons. Therefore, 31 - 3 = 28. Writing the e config: (recall aufbau principle)
Ga : 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
Ga 3+ : 1s2 2s2 2p6 3s2 3p6 4s0 3d10
or in Noble Gas core notation,
Ga3+ : [Ar]4s0 3d10

Note that 4s electrons are lost before 3d electrons thus, the electrons are deducted first to the 4s rather than 3d.

Mg2+
Atomic number of Mg is 12. Since the charge is 2+, 2 electrons are lost. Thus, 12 - 2 = 10:
Mg : 1s2 2s2 2p6 3s2
Mg2+ : 1s2 2s2 2p6

Hope this helps~ :)

1. 👍 6
2. 👎 2
2. Search 1000s of local job openings with Higher-Hire

1. 👍 0
2. 👎 1

## Similar Questions

1. ### Chemistry: Electron Configurations

Write the electron configuration for the following ion. V3+ I got 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2. In simplified form, I got [Ar]4s^2. I checked my answer against the answer given in the back of my chemistry textbook, and the two

2. ### chemistry

Identify the neutral element represented by this excited-state electron configuration, then write the ground-state electron configuration for that element. Excited State: 1s2 2s2 2p2 3s1 Element Symbol: ? Ground State: ?

3. ### Chemistry

1) What is the atomic # for selenium? 34 2) Write the full electron configuration for selenium following the (n+l) rule? I am not sure what is meant by n+l 3) write the electron configuration, grouping electrons by their "n"

4. ### Chemistry

-Calcium chloride contains calcium and chloride ions. Write the ground-state electron configuration for the calcium ion. -Write the ground-state electron configuration for the chloride ion.

1. ### Chemistry

What is electron configuration of Bi5+?

2. ### AP Chemistry

Which of the following electron configurations correspond to an excited state? Identify the atoms and write the ground-state electron configuration where appropriate. If the configuration is a noble gas, enter the noble gas in

3. ### CHEM

Consider the following neutral electron configurations in which 'n' has a constant value. Which configuration would belong to the element with the most negative electron affinity, E-ea? a) ns^2 b) ns^2 np^2 c) ns^2 np^5 d) ns^2

4. ### Chemistry

Electron Configuration for mo2+

1. ### Chemistry

Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon

2. ### Chemistry

Which element's 4+ ion would have the following electron configuration? [Kr]4d^10

3. ### chemistry

Write both the complete electron-configuration notation and the noble-gas notation for each of the elements below a. Na b. Sr c. P

4. ### Chem

Hi everyone, I'm having problems with effective nuclear charge. Regarding these problems. Calculate Zeff for a valence electron in an oxygen atom. and Calculate Zeff for the 4s electron in a copper atom, . and Calculate Zeff for a