Question

Why are there only two elements in the first period of the periodic table?(1 point)

because the first two elements both start with H and are grouped together

because the next elements have other things in common and they need to be arranged together

because each row increases in atomic mass by a specific number, so anything over five is in the second row

because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits

Answer 1

Answer:

because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by number of orbits

Answer 2

There are only two elements in the first period of the periodic table (statement 4) because only two electrons can fit in the first orbit around the nucleus, and each period on the table is organized by the number of orbits

A period is defined as an interval  required for a cycle to repeat itself.

• A period is a horizontal row of the periodic table.
• Seven periods in the periodic table, with each one beginning from the far left to right.
• Periods may contain as few as two elements and as many as thirty-two elements.
• A new period starts when a new number of orbit or principal energy levels begins filling with electrons.

Period 1 has only two elements (hydrogen and helium) as they have electrons in only the 1st energy level or first orbit and each period on the table is organized by the number of orbits or level of energy.

Learn more about periods of the periodic table:

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