No. It would have to be AX100. The column reference always comes before the row number.
No it is not invalid. It is the cell address of the cell where column B meets row 17. It is a relative cell address.
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Cell address
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absolute
An absolute cell reference in a spreadsheet (such as Excel) refers to a cell reference that remains fixed when copied or moved. It is denoted by placing a dollar sign ($) before the column letter and row number (e.g., $A$1). This ensures that the reference does not change when formulas are copied to other cells.
A cell reference is the address of the cell like A1 or B20 or C45. A cell value is what is actually in the cell. So in cell A1 you could have 23, in B20 you could have 190 and in C45 you could have 3461.
A cell reference or cell address.
The type of cell reference that changes when the formula is moved or copied is called a relative cell reference. In Excel, this is denoted by the cell address without any dollar signs (e.g., A1). When you copy a formula with a relative reference to another cell, the reference adjusts based on its new position.
cell reference or cell address
It can simply be called a cell reference. There are a number of ways of having a cell reference in a formula. See the related question below.
Normally it would be a relative address, but depending on what you want to do with the formula, you could have it as an absolute or mixed cell reference. If the cell reference is the same as the cell that the formula is in, you will have a circular reference.