C. WRITE TURE OR FALSE FOR EACH STATEMENT. REWRITE THE FALSE STATEMENTS CORRECTLY :
1. The nucleus of an atom is positively charged.
2. Atomic number is the number of protons and electrons.
3. Alpha particles carry two units of positive charge and four units of mass.
4. Gamma particles have no charge and mass.
5. The number of protons and neutrons in an atom is called the mass number.
6. Protons have 1.602 x 10-19 C of positive units.
7. Neutrons are negatively charged particles.
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8. Neutrons were discovered by Chadwick.​

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Element j is 1s 2s 2p 3s . (i) how many unpaired electrons does j have? (ii) is j a good oxidizing agent or a reducing agent? (iii) state reason for the answer.