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Chromium —
Photo Credit:

Nicolas Louis Vauquelin —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=19208861

Beryllium —
Photo Credit:

Calcium —
Photo Credit:

Barium —
Photo Credit:

Strontium —
Photo Credit:

Titanium —
Photo Credit:

Zirconium —
Photo Credit:

Uranium —
Photo Credit:

Martin Heinrich Klaproth —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=140310

Wilhelm Hisinger —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=4326957