# science

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

because the next elements have other things in common and they need to be arranged together
because the next elements have other things in common and they need to be arranged together
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
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
because each row increases in atomic mass by a specific number, so anything over five is in the second row
because each row increases in atomic mass by a specific number, so anything over five is in the second row
because the first two elements both start with H and are grouped together

On which atomic property proposed by Henry Moseley is the current periodic table of the elements based?(1 point)

electric charge
electric charge
atomic weight
atomic weight
nucleus size
nucleus size
atomic number

You plan to pass alpha particles through a field that contains a consistent type of particle. Which configuration will result in the largest deflection of alpha particles?
high-energy alpha particles passing through a field of low mass-number-particles
high-energy alpha particles passing through a field of low mass-number-particles
low-energy alpha particles passing through a field of high mass-number-particles
low-energy alpha particles passing through a field of high mass-number-particles
high-energy alpha particles passing through a field of high mass-number-particles
high-energy alpha particles passing through a field of high mass-number-particles
low-energy alpha particles passing through a field of low mass-number-particles

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The first one: There are only two electrons in the first orbit; therefore, when those two electrons are inserted (H and He), the next electron must go into the second orbit and that begins period 2.

The modern periodic table is based on atomic number; i.e., the number of protons in the nucleus.

The maximum deflection will be due to low energy alpha particles interacting with large masses.

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DrBob222

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