The most stable ion of strontium is isoelectronic with a noble gas. Which of the below is the ground state elec­tron configuration of that noble gas? Group of answer choices 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10  1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 1s2 2s2 2p6 3s2 3p6 4p6 4d10 1s2 2s2 2p6 3s2 3p6 3d10 4p6 1s2 2s2 2p6 3s2 3p6 4s2 4p6

Predict the number of valence electrons for a group IVA/14 element A)1 b)3 C)8 D)4

Which of the following represent the proper long hand form electron configuration of ruthenium, Ru, using the building-up principle?   answer choices:  a. 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 5s2 4d6 b. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d6 c. [Kr] 4d6 5s2 d. 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d6 5s2

Which of the following abbreviated electron configuration is correct for the element or ion shown with it? Hint: Consider your exceptions to the orbital filling rules. O Kr: [Ar] 4s2 4p6 4d10 O Zn²+: [Ar]4s²3d8 Se² [Ar]4s¹ 3d¹14p6 O As: [Ar]3d10 4s³ 4p² O Cr³+: [Ar] 3d³

Try Again Your answer is incorrect. • Row 3: Your list is not in the correct order. Re-order each list in the table below, if necessary, so that the atoms or ions in it are listed in order of decreasing size. atoms or ions 2+ Na, Al²+, Al F, C, Be Rb, K, Cs atoms or ions in order of decreasing size Na, Al, A₁²+ I Be, C, F Rb, K, Cs X 5

n D 3 Question 7 If we have a nitrogen atom, it will typically form a 1.-5 on 2.-3 ion Because 1. It has five valence electrons and it needs the additional electron(s) to fill its p orbitals, 2. It has three valence electrons and it needs the additional electron(s) to fill its p orbitals, 3. It will promote s orbital electrons to fill the p orbitals. 0 21 13 0 23 0 12 022 0 11 Question 8 1200 200 FB D FB D FB

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Arrange the following atoms or ions in order of increasing ionization energy: From lowest to highest ionization energy Drag and drop your selection from the following list to complete the answer: Mg²+ F F-