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SOVA2 [1]
3 years ago
6

Which of these statements is not true?question 20 options:atoms of isotopes of an element have different numbers of protons.atom

s of the same elements can have different masses.atoms are mostly empty space.the nucleus of an atom has a positive charge.save?
Chemistry
2 answers:
aniked [119]3 years ago
6 0

Atoms of isotopes of an element have different numbers of protons. i took the test

Greeley [361]3 years ago
4 0
The first one is the answer
isotopes of an atom have different number of neutrons . the number of protons are not different in isotopes of an atom
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Look at the periodic table.
zhuklara [117]

Answer:

Mg^{+2}

Explanation:

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5 0
3 years ago
A laser used to read CDs emits red light of wavelength 700 nm. How many photons does it emit each second if its power is?(a) 0.1
Elenna [48]

power = work/time

watt = joule/sec

a) power = 0.10 watt = 0.1joules/sec

work = power * time

= 0.10 * 1 =0.1joules

work is northing but energy

therefore energy is 0.1joules

according to planks quantum theory E = nhν where nis the no. of photons ; h is planks constant; ν isfrequency

hence, n = E/hν

or n = Eλ/hc (ν = c/λ)

n = (0.1*700*10^-9)/6.625*10^-34*3*10^8 = 0.3522*10^18photons

b) similar to the above calculation

here E = 1.0joules

n = (1.0*700*10^-9)/6.625*10^-34*3*10^8 = 0.3522*10^17photons

4 0
3 years ago
What term is best associated with protons or neutrons escaping to become more stable?
Gre4nikov [31]
The correct answer is C
3 0
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What is the most striking part of this simulation?
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N=4 has how many orbitals?
marin [14]

Answer:

n = 4 there are 16 orbitals

5 0
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