2. Atoms & Elements

Which of the following statements is true?

Which of the following has the largest number of neutrons?

Who is given credit for determining the charge of an electron?

Which of the following statements about the nuclear theory of atoms is false?

How many protons, neutrons, and electrons are present in an atom of 2 206Pb? (LO 2.14) (a) 82 protons, 206 neutrons, 82 electrons (b) 124 protons, 82 neutrons, 124 electrons (c) 82 protons, 124 neutrons, 82 electrons (d) 82 protons, 82 neutrons, 124 electrons

Determine whether each of the following statements is true or false. If false, correct the statement to make it true: (b) Every atom of a given element has the same number of protons.

Determine whether each of the following statements is true or false. If false, correct the statement to make it true: (a) The nucleus has most of the mass and comprises most of the volume of an atom.

Determine whether each of the following statements is true or false. If false, correct the statement to make it true: (c) The number of electrons in an atom equals the number of neutrons in the atom.

Consider an atom of 32P. (c) What is the symbol of the atom obtained by adding one neutron to 32P?

Consider an atom of 32P. (b) What is the symbol of the atom obtained by adding one proton to 32P?

Consider an atom of 32P. (a) How many protons, neutrons, and electrons does this atom contain?

Consider an atom of 58Ni. (a) How many protons, neutrons, and electrons does this atom contain?

(b) Which of these can vary without changing the identity of the element?

(a) Define atomic number and mass number.

How many protons, neutrons, and electrons are in the following atoms? (e) 239U

How many protons, neutrons, and electrons are in the following atoms? (d) 55Mn

How many protons, neutrons, and electrons are in the following atoms? (c) 59Co

Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 159Tb Protons 29 37 Neutrons 34 53 Electrons 42 34 Mass no. 79 85 Complete the fifth row of the table.

Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 159Tb Protons 29 37 Neutrons 34 53 Electrons 42 34 Mass no. 79 85 Complete the third row of the table.

Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 159Tb Protons 29 37 Neutrons 34 53 Electrons 42 34 Mass no. 79 85 Complete the second row of the table excluding the row with isotope symbol.

Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 89Y Protons 78 89 Neutrons 123 Electrons 81 50 Mass no. 195 119 227 Complete the third row of the table.

Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 89Y Protons 78 89 Neutrons 123 Electrons 81 50 Mass no. 195 119 227 Complete the second row of the table.

Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 89Y Protons 78 89 Neutrons 123 Electrons 81 50 Mass no. 195 119 227 Complete the first row of the table.

Which of the following three drawings represents a neutral Na atom? (a) (b) (c)

On a dry day, your body can accumulate static charge from walking across a carpet or from brushing your hair. If your body develops a charge of -15 mC (microcoulombs), how many excess electrons has it acquired?

Which statements about subatomic particles are true? a. If an atom has an equal number of protons and electrons, it will be charge-neutral. b. Electrons are attracted to protons. c. Electrons are much lighter than neutrons. d. Protons have twice the mass of neutrons.

Which statements about subatomic particles are false? a. Protons and electrons have charges of the same magnitude but opposite sign. b. Protons have about the same mass as neutrons. c. Some atoms don't have any protons. d. Protons and neutrons have charges of the same magnitude but opposite signs.

How many electrons does it take to equal the mass of a proton?

A helium nucleus has two protons and two neutrons. How many electrons does it take to equal the mass of a helium nucleus?

Identify the element represented by each of the following symbols and give the number of protons and neutrons in each: (b) 7533X Identify the element. Give the number of protons and neutrons.

Identify the element represented by each of the following symbols and give the number of protons and neutrons in each: (a) 115 X Identify the element.

What is the difference between an atom's atomic number and its mass number?

Identify the following elements: (a)

Which of the following statements about subatomic particles is correct?

Which of the following descriptions of a subatomic particle is correct?

Which one of the following statements about atoms and subatomic particles is correct?

Which of the following statement about subatomic particles is correct

Which of the following statements about subatomic particles is true?

What elements do q r and x represent