What properties of vector space fail to hold the following:

The set of all ordered triples of real numbers with the operations:

U= (a,b,c),V= (x,y,z), r is a real number.

Vector Addition:U+V= (a+x, b+y, c+z)

Scalar Multiplication: r *U= (a, 1, c)

I am fine with addition properties. They hold true. I am confused with scalar multiplication.

Appreciate your help.

Thanks.