The atom with atomic number 11 will most likely combine chemically with the atom whose atomic number is
3
10
12
17
The electronic configuration for atomic number 11 will be 2, 8, 1. So, this element can lose its 1 electrons in valence shell to attain a noble gas configuration. This element will combine with other element which tends to gain this electron and attain a noble gas configuration.
Element with atomic number 17 has 2, 8, 7 electron confirmation. So, it will gain this electron to attain stable noble gas configuration of 2, 8, 8.