Can someone help with this? (Picture above)

Element #1

protons = 1

neutrons = 0

electrons = 1

atomic number = 1

atomic mass = 1

Element #2

protons = 2

neutrons = 2

electrons = 2

atomic number = 2

atomic mass = 4

Element #3

protons = 3

neutrons = 3

electrons = 3

atomic number = 3

atomic mass = 6

Explanation:

Atomic mass = proton = electrons at neutral state

please give me brainliest if my answer is helpful

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explanation:

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2