Question

name julie mountz date 12/10/25 hour 2nd (atomic history/periodic table/basic atomic structure unit test) 1) which of the following is true of all the elements in the alkaline earth metal family? i. they are all metals. ii. they all have two electrons in their outermost shell. iii. they all tend to lose electrons. iv. they all have similar chemical properties. a. iii and iv only b. i, iii, and iv only c. i, ii, iii, and iv d. ii, iii, and iv only 2) the nucleus is the center of an atom. it consists of a. neutrons alone b. neutrons and electrons c. protons and neutrons d. protons and electrons 3) democritus gave his basic particle the name atomos, which means a. invisible or unseen b. simple or uncomplicated c. little or small d. indivisible or uncuttable 4) isotopes are atoms of the same element that have a different number of ___. a. nucleoles b. protons c. electrons d. neutrons 5) what did ernest rutherford conclude from his experiment? a. all of the particles in an atom were floating around in electron clouds. b. all of the particles in an atom were tightly packed into a dense ball. c. atoms had dense nuclei that were positively charged. d. atoms were composed entirely of negatively charged particles. 6) most of the volume of an atom is taken up by the _, and most of the mass of an atom is found in the _. a. electron clouds; nucleus b. nucleus; electron clouds c. electron clouds; electron clouds d. nucleus; nucleus 7) metals tend to appear on the _ side of the periodic table with the exception of ___ which is a nonmetal. a. left; lithium b. left; hydrogen c. right; neon d. right; helium 8) if an atom has 6 electrons outside of its nucleus, which combination of protons and neutrons would result in a neutral atom? a. 1 proton; 1 neutron b. 6 protons; 6 neutrons c. 1 proton; 3 neutrons d. 12 protons; 12 neutrons 9) john dalton developed many scientific theories. in one of the theories, dalton states that a. compounds are formed through the combination of two nonmetals b. only atoms of the same element can combine to form molecules c. electrons and protons are not contained in the nucleus d. atoms of different elements are different 10) how did niels bohr’s model of an atom differ from that of his predecessor, ernest rutherford? a. bohr’s model indicated that atoms contained a nucleus at their center. b. bohr’s model indicated that electrons move in clouds around the nucleus. c. bohr’s model indicated that electrons move around the nucleus in fixed paths. d. bohr’s model indicated that the nucleus had a positive rather than a negative charge

Explanation:

Question 1

Alkaline earth metals are all metals (I). They have 2 valence electrons (II), so they tend to lose electrons (III) and have similar chemical properties (IV) due to same valence electrons. So all I, II, III, IV are true.

The nucleus of an atom contains protons (positive) and neutrons (neutral). Electrons are outside the nucleus. So the nucleus consists of protons and neutrons.

Democritus named the basic particle "atomos", which means indivisible or uncuttable, as he thought atoms were the smallest indivisible particles.

Answer:

c. I, II, III, and IV

Question 2