It has ns1 electron configuration like the alkali metals.
I know that we can find how old the Earth is by knowing how much uranium ultimately decayed into lead. Uranium-238 has a very long to decay, about 4.5 billion years. So that is how we are able to understand how old the Earth is.
1. all living things are composed of cells
2. cells are the basic building blocks of life
3. All cells are created by preexisting cells
Answer:
.Periodic trends are specific patterns in the properties of chemical elements that are revealed in the periodic table of elements. Major periodic trends include electronegativity, ionization energy, electron affinity, atomic radii, ionic radius, metallic character, and chemical reactivity.
the answer is D. John Newlands <3
