. The mass number of an atom indicates the number of a) protons in the nucleus b

Question

. The mass number of an atom indicates the number of a) protons in the nucleus b) neutrons in the nucleus c) electrons in the outer shells d) protons and neutrons in the nucleus e) protons and electrons in an atom 7, Radioisotopes have unstable a) ions e) isotopes e) protons b) nuclei d) electron clouds 3 The chenical behavior of an atom is determined by a) the number of protons b) the number of neutrons c) the number and arrangement of electrons d) the size of the atom e) the mass of the atom 1. A substance containing atoms of different elements that are bonded together is cålled a(n) a) molecule c) mixture e) none of the above b) compound d) isotope o. A solution containing equal numbers of hydrogen ions and hydroxide ions is a) acidic c) neutral e) none of the above b) basic d) alkaline

Explanation / Answer

6. Option D is correct.

Atomic number = Number of protons in the nucleus.

Mass number = Number of protons + neutrons in the nucleus.

7. Option B is correct.

Atoms with unstable nuclei exhibit radioactivity.

8. Option C is correct.

Chemical properties of an element are determined by the number of electrons present in its valence shell.

9. Option B is correct.

A compound contains different elements held together by chemical bonds.

10. Option C is correct.

Acidic solutions = Number H+ ions is greater than OH- ions.

Basic solutions = Number OH- ions is greater than H+ ions.

Neutral solutions = Number H+ ions is equal to the number of OH- ions.

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