What is the element of 1s22s22p63s23p64s23d104p65s14d8?

Explanation is in the file

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[Kr]5s14d8

Explanation:

2NH 4 Cl(aq) + Pb(NO 3 ) 2 (aq) → 2NH 4 NO 3 (aq) + PbCl 2 (s)

This is a double replacement reaction, also called a double displacement, metathesis, or precipitation reaction, in which a precipitate (solid) is one of the products.

The general equation is  

AX + BY → AY + BX , where A and B are cations and X and Y are anions.

Explanation:

this is what i found let me know if its wrong or right