________ typically reduces when nuclear charge increases and electrons are added to orbitals of the same energy level (same n value), but initial ionization energy and electronegativity often rise (see bar graphs)
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CH4
Many covalent hydrides are formed when hydrogen interacts with nonmetals, including ________, PH3, H2S, and HCl.
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7A
Hydrogen, like the elements of Group ________ (17), exists as diatomic molecules and fills its outer level either via electron sharing or by acquiring one electron from metal to create a 1 ion (hydride, H)
In water, ________ is a strong base that pulls H+ from surrounding H2O molecules to form H2 and OH−:
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covalent hydrides
The conditions for producing ________ are determined by the reactivity of the other nonmetal.
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monatomic halide ions
While ________ (X) are abundant and stable, H is uncommon and reactive.
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hydride ion
The ________ is also a powerful reducing agent; for example, it reduces Ti (IV) to the free metal:
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alkali metals
Unlike ________, however, hydrogen shares its single valence electron with nonmetals rather than transferring it to them.
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hydrogen atom
A(n) ________ is made up of a single positive- charged nucleus surrounded by a single electron.
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individual molecules
The bonding between an element's atoms evolve from metallic to covalent in networks, covalent in ________, and none (noble gases exist as separate atoms)
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Hydrogen
________ may be the most significant element of all because of its simple structure.
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