A scientist named John Newlands discovered an early pattern on the periodic table regarding similarities between the first and ninth elements. What did he call this pattern?​

Ais the correct answer

The correct answer is c

Answer is to avoid experimental error

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom