PLEASE Choose the BEST answer.

1. The zigzag line on the periodic table divides

a. alkali metals and transition metals

c. semimetals and transition metals

b. metals and nonmetals

d. inert gases and halogens

2. The smallest particle into which an element can be divided and still be the same substance is a (n)
a. electron

b. proton

c. atom

d. molecule

3. Electrons are particles that

a. help make up the nucleus and have no charge

b. help make up the nucleus and are positively charged

c. are located outside of the nucleus and are negatively charged

d. are located outside of the nucleus and have no charge

4. If you found a Carbon 13 atom, you would know that

a. it has 13 protons

c. it has 13 neutrons

b. it has 13 electrons

d. it has 7 neutrons

5. What particles make up the nucleus?

a. electrons and neutrons

b. electrons and protons

c. protons and neutrons
d. electrons, protons, and neutrons

6. Neutrons are particles that

a. help make up the nucleus and have no charge

b. help make up the nucleus and are positively charged

c. are located outside of the nucleus and are negatively charged

d. are located outside of the nucleus and have no charge

7. The current model of the atom suggests that

a. proton clouds surround the nucleus
b. electron clouds surround the nucleus
c. electrons travel in definite paths around the nucleus

d. the exact path of a moving electron can be predicted

8. The mass number minus the atomic number is equal to the number of

a. protons and neutrons

b. protons

c. protons and electrons

d. neutrons

9. Mendeleev arranged the elements

a. density

b. melting point

c. how they look (appearance)

d. atomic mass

10. Which of the following is NOT found on the periodic table?

a. the atomic number of each element

b. the symbol of each element

c. the density of each element

d. the atomic mass of each element

1) Metalloids Metalloids, also called semiconductors, are the elements that border the zigzag line on the periodic table. Chemical Symbol Each square on the periodic table includes an element's name, chemical symbol, atomic number, and atomic mass.

2) Atom – the smallest particle into which an element can be divided and still be the same substance. 2. Electrons – the negatively charged particles found in all atoms.

3) Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus. ... The mass of an electron is almost 1,000 times smaller than the mass of a proton.

4) Carbon-13 (13C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu. six neutrons, resulting in an atomic mass of 12 amu.

5) Atoms are constructed of two types of elementary particles: electrons and quarks. Electrons occupy a space that surrounds an atom's nucleus. Each electron has an electrical charge of -1. Quarks make up protons and neutrons, which, in turn, make up an atom's nucleus.

6) Neutrons are the particles in an atom that have a neutral charge. They aren't positive like protons. They aren't negative like electrons.

7) The current model of the atom shows an atom that is mostly empty space. In the center is a small nucleus made of protons and neutrons.

8) The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number. Although all atoms of a given element must have the same atomic number, they need not all have the same mass number.

9) Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .

10) Letter: C

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.