Our ability to be aware of some parts of our environment while ignoring parts is called:
A. the two-track mind.
B. preconscious attention.
C. selective attention.
D. the conscious mind.

Henry moseley used x-ray experiments to determine the atomic number of elements. how did his discovery contribute to the development of the periodic table? a.it confirmed that elements should be arranged in strict order of increasing atomic mass. b.it led to elements with similar atomic numbers being grouped together. c.it allowed the elements to be placed in strict order of increasing atomic number. d.it showed that the way mendeleev grouped elements together was completely wrong.

Within nonmetals,ions that have more electrons tend to be bigger than ions that have fewer additional electrons why?

Who discovered that a dense positively charged atomic nucleus is at the core of every atom